The problems with open circuit scuba: Rob Parker transporting a "sled" of 8 composite tanks through Sump 3 at the Pena Colorada. Multiple sherpa trips carrying loads such as this were required to support pushes on more remote sumps. Seige logistics meant an equipment pyramid: on the final push the team began the effort with 72 scuba tanks. At each sump, some tanks, and people, had to be left behind while the lead divers (and their support teams) proceeded forward. Ultimately, only 5 tanks reached Sump 7 for the final push. [photo © 1984 Bill Stone].

 

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