Abstract: For inspecting and maintaining a submerged installation comprising an emergent part such as a platform, such as an artificial island or a submerged reservoir, said emergent part is equipped with a track along which a trolley associated with a diving bell can be circulated.The track is preferably installed under the platform, above the portions of the infrastructure to be inspected.

Abstract: An installation for the release of floats supporting by individual cables a structure submerged in an aqueous medium, comprising attachment means fixed on the structure and co-operating with one end of said cable, the other end carrying the float, liberating means co-operating with said attachment means, and a control station for said liberating means, wherein the first of said liberating means is connected to a principal control line connected to the control station, the subsequent liberating means being connected together in such manner that they are automatically and successively actuated after said first liberating means has been actuated via the principal control line, the principal control line and the connections between successive liberating means consisting of fluid pressure lines or electric cables.