Scope and Contents Letters from C. H. Hedgepeth to Edwin Link regarding U.S. Navy diving at 300 feet. Letters between Edwin Link and Pablo Bush Romero regarding an underwater convention in Mexico City. Letters between Edwin Link, Frank Donahue, and C. H. Hedgepeth explaining plans to place dwelling on the ocean bottom. Letters between Edwin Link, Lawrence Vineburgh, Frank Donahue, and Thomas McDonald regarding the inability to exhibit an anchor, questions on oxy-helium supply and decompression, and the...