Robert Sténuit

Sténuit became involved with underwater archeology and the search for shipwrecks, collaborating with Henri Delauze (president of COMEX). In 1968, Sténuit created the "Groupe de Recherche Archéologique Sous-Marine Post-Médiévale" (Group for Underwater Post-Medieval Archaeological Research), or "GRASP". GRASP has managed the inventory of 17 merchant shipwrecks and a number of warships from the 16th century through the 19th century.

In 1965, the Man in Sea project was taken over by a new company, Ocean Systems Inc. Link departed from the project, but Sténuit remained as a researcher, adviser and development engineer, conducting test dives in decompression chambers and underwater habitats and computing new helium-oxygen decompression tables for greater depths. In 1966, Ocean Systems established an office in London with Sténuit in charge. His professional work at this time involved drilling on off-shore oil and gas rigs in the North Sea, but in his spare time he began researching the wreck of the Spanish galleass Girona.

Edwin Link's second Man in Sea experiment was conducted in June–July 1964 in the Berry Islands (a chain in the Bahamas) with Sténuit and Jon Lindbergh, one of the sons of Charles Lindbergh, who made the first solo nonstop flight across the Atlantic. Sténuit and Lindbergh stayed in the SPID habitat (Submersible, Portable, Inflatable Dwelling) for 49 hours underwater at a depth of 432 feet, breathing a helium-oxygen mixture. Dr. Joseph B. MacInnis participated in this dive as a life support specialist. At the end of the two divers' decompression, a Sea Diver crew member and Sténuit's wife, Annie Sténuit, sustained minor injuries when the end of an air tank blew off. Sténuit, who had developed a case of the bends during decompression, still had some lingering symptoms afterwards in his shoulders and ankles, but these eventually dissipated.

From September 6–10, 1962, Sténuit participated in Man in Sea, Edwin Link's first experiment with an underwater habitat, which was performed with a submersible decompression chamber (SDC) at Villefranche-sur-Mer on the Mediterranean, at a depth of 200 feet (62 m). While submerged in the cylinder, Sténuit breathed a helium-oxygen mixture (Heliox). The experiment was conducted from Link's yacht, the Sea Diver. Sténuit remained on the sea floor for over 24 hours, becoming the world's first aquanaut.

Sténuit had a passion for history. At the age of 20, after reading 600 Milliards Sous les Mers by Harry Reiseberg, a work of fiction about shipwrecks and treasure diving, Sténuit left the Free University of Brussels, where he was studying political and diplomatic science in preparation for a career as a lawyer. In 1954 Sténuit began looking for the treasures of the Spanish fleet sunk in 1702 at the Battle of Vigo Bay by English and Dutch warships. He searched without success, finding only modern wrecks.

Sténuit began spelunking at the age of seventeen. He discovered diving in 1953, when he began scuba diving in flooded caves in Belgium. He subsequently became interested in speleology, and went on to spend many years exploring the Caves of Han-sur-Lesse.

Robert Pierre André Sténuit (born 1933 in Brussels) is a Belgian journalist, writer, and underwater archeologist. In 1962 he spent 24 hours on the floor of the Mediterranean Sea in the submersible "Link Cylinder" developed by Edwin Link, thus becoming the world's first aquanaut.

Together with another sunken treasure hunter, the American John Potter, Sténuit worked for the Atlantic Salvage Company, Ltd. on the specially-equipped vessel Dios Te Guarde for search and recovery of underwater treasure, beginning another search for the wrecks of the 1702 Plate Fleet, which lasted two years.