body 31 with a restraining ring 51 in addition the cam ring 35 has a key or lug 53 formed on a lower portion thereof that moves in a slot 55 formed in the upper body 31 for limiting rotational motion of the cam ring 35 between the locked and unlocked positions furthermore in one embodiment the cam ring 35 has crenelations 57 formed on an upper portion thereof for facilitating rotational motion of the cam ring 35 via an external influence e g diver a remotely operated vehicle rov a hydraulic or mechanical drive mechanism etc such as those known in the art referring now to fig6 another embodiment of the securing means is shown in this embodiment the cam ring comprises a cam weldment 61 having a set of weld blocks 63 on a lower portion thereof the weld blocks 63 are complementary to the blocks 41 for retaining the blocks 41 in the engaged position when the cam weldment 61 is in the locked position and for allowing the blocks 41 to move to the disengaged position when the cam weldment 61 is in the unlocked position other features of this embodiment of the invention are similar or identical to those described above the cam weldment 61 is retained in the upper body 31 with a restraining ring 65 the cam weldment 61 has a key or lug 67.