Cho Oyu | 2003 NW side

A USA expedition to Cho Oyu in 2003 via NW side, led by Hooman Aprin. Summit reached on 5th October 2003. 8 members recorded.

Expedition Details

Field	Value
ID	4444
Imported	2026-03-06 18:04:49.359634
Expedition ID	CHOY03335
Peak ID	CHOY
Year	2003
Season	3
Host Country	2
Route 1	NW side
Route 2	-
Route 3	-
Route 4	-
Nationality	USA
Leaders	Hooman Aprin
Sponsor	American Cho Oyu 2003
Success 1	True
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	2003-09-12
Summit Date	2003-10-05
Summit Time	1230
Summit Days	23
Total Days	27
Termination Date	2003-10-09
Termination Reason	1
Termination Notes	-
High Point (m)	8188
Traverse	False
Ski	False
Paraglide	False
Camps	2
Fixed Rope (m)	0
Total Members	5
Summit Members	2
Member Deaths	0
Total Hired	3
Summit Hired	1
Hired Deaths	0
No Hired	False
O2 Used	True
O2 None	False
O2 Climb	False
O2 Descent	True
O2 Sleep	False
O2 Medical	True
O2 Taken	False
O2 Unknown	False
Other Summits	-
Campsites	BC(12/09),ABC(14/09,5700m),C1(19/09,6100m),C2(20/09,7100m),Smt(05/10)
Route Notes	C2 bid by Aprin, Johnson and Pazirandeh and 3 Sherpas: left at 11:00 pm on 4 Oct and Aprin at about 7300m with stomach trouble so he and Nima Temba Sherpa turned back at about 1:00 am and return to C2. Others on up but Thundu Sherpa (Nima's brother) also turned at 7400m because toes too cold. Johnson, Pazirandeh and Tamtin Sherpa on top at 12:30 pm of 5th and back to C2 5:00 and 6:00 pm (Johnson at 6:00 pm, tired and no water to drink). At top found prayer flags and saw Everest. Gavin went to C1 four times, but each time got very high pulse rate, so no higher.
Accidents	Aprin stomach trouble; Gavin very high pulse
Achievement	-
Agency	Summit Nepal Trekking
Commercial Route	True
Standard Route	True
Primary Route	False
Primary Member	False
Primary Reference	False
Primary ID	-
Checksum	2458296
Year	2003
Summit Success	True
O2 Summary	Used
Route (lowercase)	nw side

Members

Field	Value
ID	34497
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	01
Peak ID	CHOY
Year	2003
Season	3
First Name	Hooman Nmi
Last Name	Aprin
Sex	M
Age	0
Birth Date	-
Year of Birth	1946
Calculated Age	57
Citizenship	USA
Status	Leader
Residence	Denver, Colorado
Occupation	Real estate investor
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)	7300
Summit Date 1	2003-10-05
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	(1946-2015) Died May 2015
Summit Bid	4
Summit Term	9
HCN	0
Checksum	2430138
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	hooman nmi aprin
Year of Birth	1946
Year	2003
Age at Expedition	57
Role	Leader

Field	Value
ID	34498
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	02
Peak ID	CHOY
Year	2003
Season	3
First Name	Mark
Last Name	DiMartino
Sex	M
Age	0
Birth Date	-
Year of Birth	1971
Calculated Age	32
Citizenship	USA
Status	Climber
Residence	Denver, Colorado
Occupation	Climbing equipment business's retail manager
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	19
HCN	0
Checksum	2439070
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	mark dimartino
Year of Birth	1971
Year	2003
Age at Expedition	32
Role	Member

Field	Value
ID	34499
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	03
Peak ID	CHOY
Year	2003
Season	3
First Name	Sean
Last Name	Gavin
Sex	M
Age	0
Birth Date	-
Year of Birth	1975
Calculated Age	28
Citizenship	USA
Status	Climber
Residence	Denver, Colorado
Occupation	Climbing equipment salesman
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)	6100
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	2440576
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	sean gavin
Year of Birth	1975
Year	2003
Age at Expedition	28
Role	Member

Field	Value
ID	34500
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	04
Peak ID	CHOY
Year	2003
Season	3
First Name	Jeff
Last Name	Johnson
Sex	M
Age	0
Birth Date	-
Year of Birth	1973
Calculated Age	30
Citizenship	USA
Status	Climber
Residence	Salt Lake City, Utah
Occupation	Pharmaceutical salesman
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2003-10-05
Summit Date 2	-
Summit Date 3	-
Summit Time 1	1230
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	True
O2 None	False
O2 Climb	False
O2 Descent	True
O2 Sleep	False
O2 Medical	True
O2 Notes	On return to C2 briefly because of short breath
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	5
Summit Term	1
HCN	0
Checksum	2439774
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	jeff johnson
Year of Birth	1973
Year	2003
Age at Expedition	30
Role	Member

Field	Value
ID	34501
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	05
Peak ID	CHOY
Year	2003
Season	3
First Name	Siamak
Last Name	Pazirandeh
Sex	M
Age	0
Birth Date	-
Year of Birth	1973
Calculated Age	30
Citizenship	USA
Status	Climber
Residence	San Francisco, California
Occupation	Computer programmer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2003-10-05
Summit Date 2	-
Summit Date 3	-
Summit Time 1	1230
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	5
Summit Term	1
HCN	0
Checksum	2439906
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	siamak pazirandeh
Year of Birth	1973
Year	2003
Age at Expedition	30
Role	Member

Field	Value
ID	34502
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	07
Peak ID	CHOY
Year	2003
Season	3
First Name	Tamting
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1974
Calculated Age	28
Citizenship	Nepal
Status	H-A Worker
Residence	Beding, Dolakha
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2003-10-05
Summit Date 2	-
Summit Date 3	-
Summit Time 1	1230
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	5th ascent of Cho Oyu; brother of Dawa Tashi
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2440362
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	tamting sherpa
Year of Birth	1974
Year	2003
Age at Expedition	29
Role	Hired

Field	Value
ID	47356
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	06
Peak ID	CHOY
Year	2003
Season	3
First Name	Nima Temba
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1959
Calculated Age	44
Citizenship	Nepal
Status	H-A Worker
Residence	Beding, Dolakha
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)	7300
Summit Date 1	2003-10-05
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	Brother of Thundu
Necrology	-
Summit Bid	4
Summit Term	14
HCN	0
Checksum	2434834
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	nima temba sherpa
Year of Birth	1959
Year	2003
Age at Expedition	44
Role	Hired

Field	Value
ID	47357
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY03335
Member ID	08
Peak ID	CHOY
Year	2003
Season	3
First Name	Thundu
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1978
Calculated Age	25
Citizenship	Nepal
Status	H-A Worker
Residence	Beding, Dolakha
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)	7400
Summit Date 1	2003-10-05
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	Brother of Nima Temba
Necrology	-
Summit Bid	4
Summit Term	8
HCN	0
Checksum	2441596
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	thundu sherpa
Year of Birth	1978
Year	2003
Age at Expedition	25
Role	Hired

8 recorded members.

Name	Sex	Year of Birth	Citizenship	Status	Residence	Occupation
Hooman Nmi Aprin	M	1946	USA	Leader	Denver, Colorado	Real estate investor	Details Other expeditions
Mark DiMartino	M	1971	USA	Climber	Denver, Colorado	Climbing equipment business's retail manager	Details Other expeditions
Sean Gavin	M	1975	USA	Climber	Denver, Colorado	Climbing equipment salesman	Details Other expeditions
Jeff Johnson	M	1973	USA	Climber	Salt Lake City, Utah	Pharmaceutical salesman	Details Other expeditions
Siamak Pazirandeh	M	1973	USA	Climber	San Francisco, California	Computer programmer	Details Other expeditions
Tamting Sherpa	M	1974	Nepal	H-A Worker	Beding, Dolakha	-	Details Other expeditions
Nima Temba Sherpa	M	1959	Nepal	H-A Worker	Beding, Dolakha	-	Details Other expeditions
Thundu Sherpa	M	1978	Nepal	H-A Worker	Beding, Dolakha	-	Details Other expeditions

References

0 recorded references.