A buoyancy compensator jacket for scuba diving includes an inflatable and deflatable bladder; a backplate part, to which the bladder and elements fastening at least one breathing gas cylinder are attached; and at least one pair of shoulder straps for securing it to the torso of a user and at least one ventral securing strap or ventral closure of the jacket. The jacket further includes a sternal securing element composed of at least one sternal or chest strap, which has at least one costal connection element distinct from the pair of shoulder straps and connecting the sternal strap to the backplate part.

A vent valve for a buoyancy control device suitable for divers, where the valve may be opened by any combination of over-pressure, manual pressure relief or a powered means, where a force to a valve plug is applied by means of a spring that is constrained to prevent entirely lateral and angular movement but in which movement of the plug in the axis of the seat is unconstrained.

Systems, devices, and methods are provided for underwater lighting and enhanced visibility for divers using interchangeable lens filters.

A buoyancy compensator bladder includes an air cell, a connector, a low-pressure inflator (LPI), and at least one over pressure valve. The LPI which inflates and deflates the air cell is positioned on an outer surface of the air cell. As a result, when the fully assembled buoyancy compensator is equipped by a diver, the LPI runs from behind the diver's torso and under their armpit. This results in the inflator head which is part of the LPI to be disposed on the front of the diver's chest during back mount or side mount diving. This structure allows the bladder to be easily used for either back mount or side mount diving. The bladder may further be equipped with auxiliary/non-essential devices such as wight pockets/pouches.