"Exploration sous-marine." . . "Bathygraphe." . . . . "Sous-marins." . . . . "The deep Submersible" . . . "The deep submersible" . . "The deep submersible"@en . . . . . . . . . . . . . "Describes the salient features and scientific uses of manned undersea vehicles. For the specialist and the layman." . .