A shot gun flotation device includes an inflatable arrangement comprising a water sensitive mechanism; an inflatable bladder; and a source of gas for inflating the inflatable element. Housing has a first tubular section attached to the shot gun, a tubular transition section, and a second tubular section for housing the inflatable arrangement. A further embodiment comprises an attachment adapter, a frame, and a sheath. The attachment adapter includes a first end section with threads for attachment to the shot gun, a middle section for mounting a ring, and a second end section with external threads for engaging the frame. The frame supports an inflatable arrangement and a sheath houses the inflatable arrangement and the frame when in an inoperative state. Further embodiments include an inflatable arrangement with a bladder stored in housing and a CO.sub.2 cartridge for inflating the bladder when the inflatable arrangement is activated.

A shot gun flotation device includes an inflatable arrangement comprising a water sensitive mechanism; an inflatable bladder; and a source of gas for inflating the inflatable element. Housing has a first tubular section attached to the shot gun, a tubular transition section, and a second tubular section for housing the inflatable arrangement. A further embodiment comprises an attachment adapter, a frame, and a sheath. The attachment adapter includes a first end section with threads for attachment to the shot gun, a middle section for mounting a ring, and a second end section with external threads for engaging the frame. The frame supports an inflatable arrangement and a sheath houses the inflatable arrangement and the frame when in an inoperative state. Further embodiments include an inflatable arrangement with a bladder stored in housing and a CO.sub.2 cartridge for inflating the bladder when the inflatable arrangement is activated.

A subsea structure monitoring system can include a base device configured to be secured to a subsea structure. The subsea structure monitoring system can also include a release mechanism disposed within the base device, where the release mechanism has a default state and a released state. The subsea structure monitoring system can further include a buoy detachably coupled to the release mechanism, where the buoy includes a housing that houses a communication module and a switch. The subsea structure monitoring system can also include a trigger that is configured to convert the release mechanism from the default state to the released state. The release mechanism can be converted from the default state to the released state when the trigger exerts a minimum force on the release mechanism.