Three weeks after Whittaker and Gombu reached the top of Everest, four other team members followed suit on 22 May. Lute Jerstad and Barry Bishop followed the same South Col route as Whittaker but Tom Hornbein and Willi Unsoeld attempted the West Ridge route that had previously never been attempted. The four planned to meet at the top where Jerstad and Bishop would lead Hornbein and Unsoeld down via the South Col. Hornbein and Unsoeld made the first ascent of the West Ridge but not until 6:00 pm. Having waited as long as they could Jerstad and Bishop headed down the South Col alone. Hornbein and Unsoeld followed their teammates boot tracks down and met up around 10:00 pm at 28,000 feet. The four were forced to bivouac and used their Eddie Bauer down clothing for shelter.