Abstract: An apparatus according to the invention for suspending a submarine on a submerged structure and comprising a preshaped semi-rigid strap wound onto a drum disposed in a casing fixed to said submarine, whereby the strap when unwound adopts the shape of a generally circular loop so as to pass round one of the cross-members of the submerged structure and has at its free end means for cooperating with a locking device disposed on the path adopted by the strap with respect to the casing, whereby the locking device comprises safety means for bringing about the release thereof in the case of a defect to the locking system.