1. A surface seeking underwater demolition device capable of being ejected from a torpedo tube for blasting a passageway in an ice pack to allow an underwater craft to surface comprising a casing, a float removably attached to one end of said casing, said float causing the device to be buoyant so that it will rise to the underside of the ice pack, guide fins removably attached to the other end of said casing, a copious quantity of explosives located in said casing, a hydrostatically actuated switch in said casing, delay means actuated by said hydrostatic switch for delaying operation of said device a short period of time, a source of electrical power connected to one side of said delay means, an electro-responsive squib connected between the other side of said delay means and said source of electrical power, a releasing pistol located on said casing with said squib mounted therein, a connecting cable normally holding said float to said casing and passing through said releasing pistol, a cutter located in said releasing pistol for cutting said connecting cable when operated by said squib to release said float, a standoff cable attached to said casing and said float for suspending said casing at a depth of several feet below said float, an electrical switch, pressure sensitive means for determining when the casing has been suspended below said float and for closing said electrical switch, and detonating means connected to said source of electrical power by said electrical switch for detonating the quantity of explosives.