With naval research funding constrained by Vietnam War combat requirements, it was four years later before SEALAB III used the refurbished SEALAB II habitat placed in water three times deeper. Five teams of nine divers were scheduled to spend 12 days each in the habitat, testing new salvage techniques and conducting oceanographic and fishery studies. Preparations for such a deep dive were extensive. In addition to many biomedical studies, work-up dives were conducted at the U.S. Navy Experimental Diving Unit at the Washington, D.C., Navy Yard. These “dives” were not done in the open sea, but in a special hyperbaric chamber that could recreate the pressures at depths as great as of sea water.