Everest | 1991 S Col-SE Ridge
A Japan expedition to Everest in 1991 via S Col-SE Ridge, led by Yasuo Iwazoe. Summit reached on 5th October 1991. 10 members recorded.
Expedition Details
| Field | Value |
|---|---|
| ID | 606 |
| Imported | 2026-03-06 18:04:49.359634 |
| Expedition ID | EVER91309 |
| Peak ID | EVER |
| Year | 1991 |
| Season | 3 |
| Host Country | 1 |
| Route 1 | S Col-SE Ridge |
| Route 2 | - |
| Route 3 | - |
| Route 4 | - |
| Nationality | Japan |
| Leaders | Yasuo Iwazoe |
| Sponsor | G-Tohan (Ascent) Club Everest Expedition 1991 |
| 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 | 1991-09-11 |
| Summit Date | 1991-10-05 |
| Summit Time | - |
| Summit Days | 24 |
| Total Days | 31 |
| Termination Date | 1991-10-12 |
| Termination Reason | 8 |
| Termination Notes | Abandoned at 8750m due to oxygen finished and C4 tent broken by wind |
| High Point (m) | 8750 |
| Traverse | False |
| Ski | False |
| Paraglide | False |
| Camps | 4 |
| Fixed Rope (m) | 0 |
| Total Members | 8 |
| Summit Members | 0 |
| Member Deaths | 0 |
| Total Hired | 6 |
| Summit Hired | 0 |
| Hired Deaths | 0 |
| No Hired | False |
| O2 Used | True |
| O2 None | False |
| O2 Climb | True |
| O2 Descent | False |
| O2 Sleep | False |
| O2 Medical | False |
| O2 Taken | False |
| O2 Unknown | False |
| Other Summits | - |
| Campsites | BC(11/09,5350m),C1(14/09,6100m),C2(16/09,6400m),C3(21/09,7300m),C4(30/09,7900m),xxx(05/10,8750m) |
| Route Notes | C2 in Western Cwm C3 on Lhotse Face C4 at South Col High point at South Summit. 30th Sept Sherpas pitched C4 but camp not slept in till 1st Oct. Sherpas go very quickly but Japanese members very slow. 1st summit attack from col 1/2 Oct and Nakajima reached 8500m, Iwazoe to 8250m and Sherpas Phinzo and Nawang Choklang to 8500m. Iwazoe back because carrying 2 oxygen bottles and they were very heavy; other turned back because snow very soft and deep (at 8500m at 3 am) and sirdar said when sun comes avalanches will start. 2nd summit attack from C4 on 5 Oct by Ono and Phinzo: started 6:30 am, reached S Summit 2 pm, then down because oxygen finished. No more attacks; 3rd attack for summit planned but when Sherpas reached C4, they found tent broken by winds. All members reached C3. Left BC 12 Oct. |
| Accidents | None |
| Achievement | - |
| Agency | Cosmo Treks |
| Commercial Route | True |
| Standard Route | True |
| Primary Route | False |
| Primary Member | False |
| Primary Reference | - |
| Primary ID | - |
| Checksum | 2450706 |
| Year | 1991 |
| Summit Success | False |
| O2 Summary | Used |
| Route (lowercase) | s col-se ridge |
Members
10 recorded members.
| Name | Sex | Year of Birth | Citizenship | Status | Residence | Occupation | |
|---|---|---|---|---|---|---|---|
| Fumiaki Hayakawa | M | 1964 | Japan | Climber | Tokyo, Japan | Civil servant | Details Other expeditions |
| Yasuo Iwazoe | M | 1947 | Japan | Leader | Tokyo, Japan | President, shoe sales company | Details Other expeditions |
| Keisuke Kawamura | M | 1959 | Japan | Climber | Tokyo, Japan | Coffee shop manager | Details Other expeditions |
| Akira Nakajima | M | 1962 | Japan | Climber | Tokyo, Japan | Engineer | Details Other expeditions |
| Shozo Ono | M | 1964 | Japan | Climber | Machida, Tokyo, Japan | Chemical engineer | Details Other expeditions |
| Aogu Sumikawa | M | 1949 | Japan | Climber | Tokyo, Japan | Air-conditioning engineer | Details Other expeditions |
| Masayuki Suzuki | M | 1949 | Japan | Climber | Tokyo, Japan | Civil servant | Details Other expeditions |
| Ryoji Yamada | M | 1963 | Japan | Climber | Yokohama, Japan | Computer engineer | Details Other expeditions |
| Nawang Choklang Sherpa | M | - | Nepal | Sirdar | - | - | Details Other expeditions |
| Phinzo Sherpa | M | - | Nepal | H-A Worker | - | - | Details Other expeditions |
References
4 recorded references.
| Expedition ID | Journal | Author | Title | Publisher | Citation | Yak 94 |
|---|---|---|---|---|---|---|
| EVER91309 | AAJ | Hawley, Elizabeth | - | - | 66:205 (1992) | - |
| EVER91309 | IWA | - | - | - | :215 (1992) | - |
| EVER91309 | IWA | - | - | - | :55 (1992) | - |
| EVER91309 | - | - | http://publications.americanalpineclub.org/articles/12199220502/Asia-Nepal-Everest-South-Col-Post-Monsoon-Attempts | - | - | - |