In September 1967 MacInnis took part in a classified Ocean Systems mission aboard '' Deep Diver '' on the Grand Banks south of Newfoundland . A cable plow , rumored to be used for burying a strategic communications cable , had been lost in 400 feet of water . Two Navy divers had already been killed trying to recover it . MacInnis was one of a crew of four Ocean Systems personnel who unsuccessfully attempted to recover the cable plow using the submersible . The mission was called off due to rising winds , and '' Deep Diver '' was barely brought safely back aboard the Canadian Coast Guard vessel CCGS '' John Cabot '' . In 1968 MacInnis took part in a saturation dive aboard the Hydrolab underwater habitat with two other aquanauts , spending 50 hours at a depth of 50 feet , and in the search for the lost submarine USS '' Scorpion '' . In late 1968 and early 1969 , MacInnis took part in salvage operations after the crash of Pan Am Flight 217 near Caracas , Venezuela
Pan Am Flight 217
Pan Am Flight 217
Joseph B. MacInnis