Underwater shackle for heavy loads, comprising a shackle body equipped with respective side plates and an upper, intermediate suspension for connection to a lifting strap, a lifting cable or the like, and also a lower locking bolt for connection to the load, - the locking bolt is movable arranged in a hydraulically driven cylinder arrangement , where the cylinder arrangement is placed adjoining one of the side plates , and where the cylinder arrangement is arranged to be pressurised by a pressure medium to move the locking bolt between a withdrawn position in the cylinder arrangement and a locking position in the shackle body , - the cylinder arrangement comprises an inner cylinder boring , where a piston part of the locking bolt is arranged for longitudinal movement in the boring, and a first inlet channel for supply of the pressure medium to a first side of the piston part , arranged for an outgoing movement of the locking bolt from the cylinder arrangement and also a second inlet channel for supply of the pressure medium to the other side of the piston part , arranged for ingoing movement of the locking bolt into the cylinder arrangement , wherein said underwater shackle further comprises - a pressure distributor to receive and distribute the pressure medium is arranged to the cylinder arrangement , where the pressure distributor comprises supply channels that run together with said first and second inlet channels in the cylinder arrangement , characterized in that the cylinder arrangement comprises a spring-loaded locking peg arranged to securely lock the locking bolt when it is in the locking position in the shackle body , the locking peg is coupled to, or integrated with, a locking plate which is movable arranged in the pressure distributor , and where a mouthpiece is arranged to trigger movement of the locking plate , and the locking plate comprises respective openings that lie in associated borings in the pressure distributor and that a nose of the mouthpiece is arranged to be inserted into or taken out of said openings for raising and lowering, respectively, of the locking plate . - the locking bolt is movable arranged in a hydraulically driven cylinder arrangement , where the cylinder arrangement is placed adjoining one of the side plates , and where the cylinder arrangement is arranged to be pressurised by a pressure medium to move the locking bolt between a withdrawn position in the cylinder arrangement and a locking position in the shackle body , - the cylinder arrangement comprises an inner cylinder boring , where a piston part of the locking bolt is arranged for longitudinal movement in the boring, and a first inlet channel for supply of the pressure medium to a first side of the piston part , arranged for an outgoing movement of the locking bolt from the cylinder arrangement and also a second inlet channel for supply of the pressure medium to the other side of the piston part , arranged for ingoing movement of the locking bolt into the cylinder arrangement , wherein said underwater shackle further comprises - a pressure distributor to receive and distribute the pressure medium is arranged to the cylinder arrangement , where the pressure distributor comprises supply channels that run together with said first and second inlet channels in the cylinder arrangement , characterized in that <EOS>