Chief of Naval Operations Arleigh Burk knew about it, but few others not directly associated with it did. deep-sea diving program was deliberately conducted with no publicity. The original Trieste sphere was designed to reach a 20,000-foot depth, but, after purchase, it was replaced with a German Krupp-manufactured sphere rated for 36,000 feet (and was actually over-designed, with walls 5 inches thick). The crew of two rode in a sphere slung underneath. Most of its hull held 22,000 gallons of aviation gasoline for buoyancy, plus water ballast tanks and releasable iron ballast (held by electromagnets so that if there was an electrical failure, the iron ballast would automatically drop and the bathyscaphe would rise). Trieste was assigned to the Naval Electronics Laboratory in San Diego and conducted some deep dives off the West Coast before being shipped to Guam. ![]() Navy in 1958 for $250,000 (roughly $2.2 million to today) for the purpose of conducting deep-dive research. ![]() The deep-diving bathyscaphe Trieste, launched in 1953, was designed by Swiss scientist August Piccard, built in Italy, and initially operated by the French navy.
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