News in Brief: Florida, Operation Sub-scape. Navy volunteers test new submarine escape gear in an ascent from the greatest depth ever, a full 50 fathoms, or 302 feet. From the jaws of Davy Jones' locker to the surface and safety. Interior submarine, men wearing shorts and equipment climb ladder. Underwater scenes: two men apparently exit from top of sub, are buoyed upwards. Men break surface of water.