Abstract: A single line deep-sea bucket and release is provided for mining operations and emergency fouling situations at extreme depths. A clamshell mechanism is provided with a bucket support frame and a hoisting frame with coupling means maintaining a fixed connection on descent. The clamshell, descending in the normally open position, is closed on ascent by an operating cable actuated to close by a measured withdrawal of the two frames and coupling means to which the actuating cable is fastened. Emergency shell release opening is caused by gravity force of a descending messenger on the single hoisting cable to trip a release of the coupling means and thereby the attached withdrawn operating cable to descend and open the shell.