Cho Oyu | 2005 NW side

A Netherlands expedition to Cho Oyu in 2005 via NW side, led by Rene de Bos. Summit reached on 22nd May 2005. 18 members recorded.

Expedition Details

Field	Value
ID	4865
Imported	2026-03-06 18:04:49.359634
Expedition ID	CHOY05124
Peak ID	CHOY
Year	2005
Season	1
Host Country	2
Route 1	NW side
Route 2	-
Route 3	-
Route 4	-
Nationality	Netherlands
Leaders	Rene de Bos
Sponsor	Snow Leopard Adventures Cho Oyu 2005
Success 1	False
Success 2	False
Success 3	False
Success 4	False
Ascent 1	-
Ascent 2	-
Ascent 3	-
Ascent 4	-
Claimed	False
Disputed	False
Countries	-
Approach	-
Basecamp Date	2005-05-01
Summit Date	2005-05-22
Summit Time	-
Summit Days	21
Total Days	25
Termination Date	2005-05-26
Termination Reason	7
Termination Notes	Abandoned at 8050m due to all tired and no more time
High Point (m)	8050
Traverse	False
Ski	False
Paraglide	False
Camps	3
Fixed Rope (m)	0
Total Members	16
Summit Members	0
Member Deaths	0
Total Hired	5
Summit Hired	0
Hired Deaths	0
No Hired	False
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Taken	True
O2 Unknown	False
Other Summits	-
Campsites	BC(01/05),ABC(04/05,5700m),C1(08/05,6400m),C2(10/05,7000m),C3(21/05,7450m),xxx(22/05,8050m)
Route Notes	Summit party of others and Overbeeke and Van den Bos from C3 with Kaji and Pemba Gyalzen Sherpa at 5:00 am (NST). Kaji turned back at about 7500m (cold feet) and Pemba at 7600m (cold and tired). Both Dutch reached last snow field. Overbeeke to 8000m and Van den Bos to 8050m. This was at 12:00 noon and now too late to get to top withouth oxygen and not moving fast enough, clouds building looking like storm coming, so both to C3 together and to C1 on 24th. This was the highest by expedition and now yaks coming on 25th so climb finished. Sherpas: Kaji, Sankhuwasabha, 12/7/78 Pemba Gyalzen, Khumjung, 21/6/73, no 8000ers
Accidents	Nothing serious but Vis had altitude problem and left expedition 9 May
Achievement	-
Agency	Asian Trekking
Commercial Route	True
Standard Route	True
Primary Route	False
Primary Member	False
Primary Reference	False
Primary ID	-
Checksum	2458938
Year	2005
Summit Success	False
O2 Summary	None
Route (lowercase)	nw side

Members

Field	Value
ID	37490
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	02
Peak ID	CHOY
Year	2005
Season	1
First Name	Frederike
Last Name	Bloemers
Sex	F
Age	0
Birth Date	-
Year of Birth	1955
Calculated Age	50
Citizenship	Netherlands
Status	Climber
Residence	Arnhem, Netherlands
Occupation	Attorney
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2433257
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	frederike bloemers
Year of Birth	1955
Year	2005
Age at Expedition	50
Role	Member

Field	Value
ID	37491
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	03
Peak ID	CHOY
Year	2005
Season	1
First Name	Thomas Adrianus (Thom)
Last Name	Bogaard
Sex	M
Age	0
Birth Date	-
Year of Birth	1968
Calculated Age	36
Citizenship	Netherlands
Status	Climber
Residence	Amsterdam, Netherlands
Occupation	University hydrology profession
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2438190
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	thomas adrianus (thom) bogaard
Year of Birth	1968
Year	2005
Age at Expedition	37
Role	Member

Field	Value
ID	37492
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	04
Peak ID	CHOY
Year	2005
Season	1
First Name	Suzanne
Last Name	Castelein
Sex	F
Age	0
Birth Date	-
Year of Birth	1970
Calculated Age	35
Citizenship	Netherlands
Status	Climber
Residence	Amsterdam, Netherlands
Occupation	Geologist
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2438674
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	suzanne castelein
Year of Birth	1970
Year	2005
Age at Expedition	35
Role	Member

Field	Value
ID	37493
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	01
Peak ID	CHOY
Year	2005
Season	1
First Name	Rene
Last Name	De Bos
Sex	M
Age	0
Birth Date	-
Year of Birth	1959
Calculated Age	46
Citizenship	Netherlands
Status	Leader
Residence	The Hague, Netherlands
Occupation	Tour company owner
Leader	True
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2434632
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	rene de bos
Year of Birth	1959
Year	2005
Age at Expedition	46
Role	Leader

Field	Value
ID	37494
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	05
Peak ID	CHOY
Year	2005
Season	1
First Name	Robert Arian
Last Name	Eckhardt
Sex	M
Age	0
Birth Date	-
Year of Birth	1949
Calculated Age	55
Citizenship	Netherlands
Status	Climber
Residence	Voorschoten, Netherlands
Occupation	Editor
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2431122
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	robert arian eckhardt
Year of Birth	1949
Year	2005
Age at Expedition	56
Role	Member

Field	Value
ID	37495
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	06
Peak ID	CHOY
Year	2005
Season	1
First Name	Frank
Last Name	Husslage
Sex	M
Age	0
Birth Date	-
Year of Birth	1958
Calculated Age	46
Citizenship	Netherlands
Status	Climber
Residence	Middelburg, Netherlands
Occupation	Editor
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2434567
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	frank husslage
Year of Birth	1958
Year	2005
Age at Expedition	47
Role	Member

Field	Value
ID	37496
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	07
Peak ID	CHOY
Year	2005
Season	1
First Name	Simon Petrus
Last Name	Kossen
Sex	M
Age	0
Birth Date	-
Year of Birth	1952
Calculated Age	52
Citizenship	Netherlands
Status	Climber
Residence	Tilburg, Netherlands
Occupation	Chemical engineer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2432238
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	simon petrus kossen
Year of Birth	1952
Year	2005
Age at Expedition	53
Role	Member

Field	Value
ID	37497
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	08
Peak ID	CHOY
Year	2005
Season	1
First Name	Alexander O. (Lex)
Last Name	Ottervanger
Sex	M
Age	0
Birth Date	-
Year of Birth	1957
Calculated Age	47
Citizenship	Netherlands
Status	Climber
Residence	Leiderdorp, Netherlands
Occupation	Systems engineer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2434088
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	alexander o. (lex) ottervanger
Year of Birth	1957
Year	2005
Age at Expedition	48
Role	Member

Field	Value
ID	37498
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	09
Peak ID	CHOY
Year	2005
Season	1
First Name	Edwin
Last Name	Overbeeke
Sex	M
Age	0
Birth Date	-
Year of Birth	1960
Calculated Age	44
Citizenship	Netherlands
Status	Climber
Residence	Nieuwegein, Netherlands
Occupation	Information technology consultant
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	8000
Summit Date 1	2005-05-22
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	4
Summit Term	13
HCN	0
Checksum	2435187
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	edwin overbeeke
Year of Birth	1960
Year	2005
Age at Expedition	45
Role	Member

Field	Value
ID	37499
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	10
Peak ID	CHOY
Year	2005
Season	1
First Name	Paul
Last Name	Strik
Sex	M
Age	0
Birth Date	-
Year of Birth	1973
Calculated Age	31
Citizenship	Netherlands
Status	Climber
Residence	Helmond, Netherlands
Occupation	Manager in packaging manufacturing company
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2439916
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	paul strik
Year of Birth	1973
Year	2005
Age at Expedition	32
Role	Member

Field	Value
ID	37500
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	11
Peak ID	CHOY
Year	2005
Season	1
First Name	Jacobus Cornelis (Kase)
Last Name	Terhell
Sex	M
Age	0
Birth Date	-
Year of Birth	1960
Calculated Age	44
Citizenship	Netherlands
Status	Climber
Residence	Arusha, Tanzania
Occupation	Construction engineer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2435313
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	jacobus cornelis (kase) terhell
Year of Birth	1960
Year	2005
Age at Expedition	45
Role	Member

Field	Value
ID	37501
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	12
Peak ID	CHOY
Year	2005
Season	1
First Name	Hendrik (Henk)
Last Name	Van Bilderbeek
Sex	M
Age	0
Birth Date	-
Year of Birth	1947
Calculated Age	57
Citizenship	Netherlands
Status	Climber
Residence	Delft, Netherlands
Occupation	Patent examier
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2430391
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	hendrik (henk) van bilderbeek
Year of Birth	1947
Year	2005
Age at Expedition	58
Role	Member

Field	Value
ID	37502
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	13
Peak ID	CHOY
Year	2005
Season	1
First Name	Jan
Last Name	Van den Bos
Sex	M
Age	0
Birth Date	-
Year of Birth	1955
Calculated Age	50
Citizenship	Netherlands
Status	Climber
Residence	The Hague, Netherlands
Occupation	Environmental engineer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	8050
Summit Date 1	2005-05-22
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	4
Summit Term	13
HCN	0
Checksum	2433208
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	jan van den bos
Year of Birth	1955
Year	2005
Age at Expedition	50
Role	Member

Field	Value
ID	37503
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	14
Peak ID	CHOY
Year	2005
Season	1
First Name	Hans
Last Name	Vis
Sex	M
Age	0
Birth Date	-
Year of Birth	1943
Calculated Age	61
Citizenship	Netherlands
Status	Climber
Residence	Alpen a/d Riyn, Netherlands
Occupation	Management consultant
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	1
Summit Term	6
HCN	0
Checksum	2428905
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	hans vis
Year of Birth	1943
Year	2005
Age at Expedition	62
Role	Member

Field	Value
ID	37504
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	15
Peak ID	CHOY
Year	2005
Season	1
First Name	Jaap
Last Name	Vuijk
Sex	M
Age	0
Birth Date	-
Year of Birth	1963
Calculated Age	42
Citizenship	Netherlands
Status	Climber
Residence	The Hague, Netherlands
Occupation	Anasthesiologist
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2436069
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	jaap vuijk
Year of Birth	1963
Year	2005
Age at Expedition	42
Role	Member

Field	Value
ID	37505
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	16
Peak ID	CHOY
Year	2005
Season	1
First Name	Evert
Last Name	Wesker
Sex	M
Age	0
Birth Date	-
Year of Birth	1952
Calculated Age	52
Citizenship	Netherlands
Status	Climber
Residence	Amsterdam, Netherlands
Occupation	Petroleum research engineer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	0
Summit Term	0
HCN	0
Checksum	2432328
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	evert wesker
Year of Birth	1952
Year	2005
Age at Expedition	53
Role	Member

Field	Value
ID	47282
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	17
Peak ID	CHOY
Year	2005
Season	1
First Name	Ang Kazi (Ankaji)
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1978
Calculated Age	26
Citizenship	Nepal
Status	H-A Worker
Residence	Chitre, Sisuwa-9, Makalu-Barun
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	False
Personal High Point (m)	7500
Summit Date 1	2005-05-22
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	1st 8000er
Necrology	-
Summit Bid	4
Summit Term	8
HCN	0
Checksum	2441647
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	ang kazi (ankaji) sherpa
Year of Birth	1978
Year	2005
Age at Expedition	27
Role	Hired

Field	Value
ID	47283
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05124
Member ID	18
Peak ID	CHOY
Year	2005
Season	1
First Name	Pemba Gyalzen
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1973
Calculated Age	31
Citizenship	Nepal
Status	H-A Worker
Residence	Khumjung, Khumbu
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	False
Personal High Point (m)	7600
Summit Date 1	2005-05-22
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	2nd ascent of Everest
Necrology	-
Summit Bid	4
Summit Term	8
HCN	0
Checksum	2439867
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	pemba gyalzen sherpa
Year of Birth	1973
Year	2005
Age at Expedition	32
Role	Hired

18 recorded members.

Name	Sex	Year of Birth	Citizenship	Status	Residence	Occupation
Frederike Bloemers	F	1955	Netherlands	Climber	Arnhem, Netherlands	Attorney	Details Other expeditions
Thomas Adrianus (Thom) Bogaard	M	1968	Netherlands	Climber	Amsterdam, Netherlands	University hydrology profession	Details Other expeditions
Suzanne Castelein	F	1970	Netherlands	Climber	Amsterdam, Netherlands	Geologist	Details Other expeditions
Rene De Bos	M	1959	Netherlands	Leader	The Hague, Netherlands	Tour company owner	Details Other expeditions
Robert Arian Eckhardt	M	1949	Netherlands	Climber	Voorschoten, Netherlands	Editor	Details Other expeditions
Frank Husslage	M	1958	Netherlands	Climber	Middelburg, Netherlands	Editor	Details Other expeditions
Simon Petrus Kossen	M	1952	Netherlands	Climber	Tilburg, Netherlands	Chemical engineer	Details Other expeditions
Alexander O. (Lex) Ottervanger	M	1957	Netherlands	Climber	Leiderdorp, Netherlands	Systems engineer	Details Other expeditions
Edwin Overbeeke	M	1960	Netherlands	Climber	Nieuwegein, Netherlands	Information technology consultant	Details Other expeditions
Paul Strik	M	1973	Netherlands	Climber	Helmond, Netherlands	Manager in packaging manufacturing company	Details Other expeditions
Jacobus Cornelis (Kase) Terhell	M	1960	Netherlands	Climber	Arusha, Tanzania	Construction engineer	Details Other expeditions
Hendrik (Henk) Van Bilderbeek	M	1947	Netherlands	Climber	Delft, Netherlands	Patent examier	Details Other expeditions
Jan Van den Bos	M	1955	Netherlands	Climber	The Hague, Netherlands	Environmental engineer	Details Other expeditions
Hans Vis	M	1943	Netherlands	Climber	Alpen a/d Riyn, Netherlands	Management consultant	Details Other expeditions
Jaap Vuijk	M	1963	Netherlands	Climber	The Hague, Netherlands	Anasthesiologist	Details Other expeditions
Evert Wesker	M	1952	Netherlands	Climber	Amsterdam, Netherlands	Petroleum research engineer	Details Other expeditions
Ang Kazi (Ankaji) Sherpa	M	1978	Nepal	H-A Worker	Chitre, Sisuwa-9, Makalu-Barun	-	Details Other expeditions
Pemba Gyalzen Sherpa	M	1973	Nepal	H-A Worker	Khumjung, Khumbu	-	Details Other expeditions

References

Field	Value
ID	7958
Imported	2026-03-06 18:06:36.307770
Expedition ID	CHOY05124
Reference ID	01
Year	2005
Type	5
Journal	-
Author	-
Title	http://www.everestnews.com/exp2005/dutchcho2005.htm
Publisher	-
Publication Date	-
Language	-
Citation	-
Yak 94	-
Notes	-

1 recorded references.

Expedition ID	Journal	Author	Title	Publisher	Citation	Yak 94
CHOY05124	-	-	http://www.everestnews.com/exp2005/dutchcho2005.htm	-	-	-