Bathyscaphes

thumb|Bathyscaphe Trieste (bathyscaphe)|Trieste before its only dive into the [[Mariana Trench]] thumb|The Trieste in 1958

Nautile is a crewed submersible owned by Ifremer, the French Research Institute for Exploitation of the Sea. Commissioned in 1984, the submersible can be operated at depths of up to .

The bathyscaphe Archimède is a deep diving research submersible of the French Navy. It used 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 .

crewed submersible