On Scripps Institution of Oceanography's INDOPAC Expedition Leg 3, the chief scientist, Dr. Joseph L. Reid, and oceanographer Arnold W. Mantyla made a hydrocast of a free vehicle INDOPAC Expedition, Leg 3, R/V. Thomas Washington Informal Report, SIO INDP03WT) (a special-purpose benthic lander (or "baited camera") for measurements of water temperature and salinity) on 27 May 1976 into the western basin of the Challenger Deep, "Station 21," at Coord at about 10840 meters depth.