Archimède

The bathyscaphe Archimède is a deep diving research submersible of the French Navy. It used 42000 gal of hexane as the gasoline buoyancy of its float. It was designed by Pierre Willm and Georges Houot. In 1964, Archimède descended into "what was then thought to be the deepest part of the Puerto Rico Trench", which the NY Times reported as 27500 ft.

Archimède was christened on 27 July 1961, at the French Navy base of Toulon. It was designed to go beyond 30000 ft, and displaced 61 tons. In October 1961, Archimède passed its first dive tests, diving to 5000 ft unmanned. On 27 November 1961, Archimède achieved a speed of 3 kn, over a distance of 4.5 mi at a depth of 7870 ft in the Mediterranean Sea.

On 23 May 1962, Archimède descended to 15744 ft off Honshu, Japan, in the Pacific, at the Japan Deep. On 15 July 1962, Archimède descended to 31350 ft into the Kurile-Kamchatcha Trench, making it the second deepest dive ever, at that point in time, second only to the BATHYSCAPHE Trieste dive on the Challenger Deep. On 12 August 1962, Archimède descended to 30511 ft in the Japan Deep south of Tokyo.

Archimède explored the Mid-Atlantic Ridge jointly with the submarine Cyana and submersible DSV Alvin, in Project FAMOUS (French-American Mid-Ocean Undersea Study) in 1974.

Archimède operated until the 1970s. It was placed on reserve in 1975, and decommissioned in 1978.

Since 2001, Archimède is on display at the Cité de la Mer museum in Cherbourg.

Archimède was honoured with a stamp in Palau.