rest, and yells "I FEEL FINE", while a corpsman examines the testee. Successfully completing the escape training requires two trials, one of them at double the depth of the first. On completion of escape training, testees are now considered bubbleheads. , the Steinke Hood has been replaced with the Mark 10 Submarine Escape Immersion Equipment (SEIE) suit. The Mark 10 allows submariners to escape from much deeper depths than currently possible with the Steinke Hood. The Mark 8, its predecessor, was a double layer suit which gave the wearer the appearance of a Michelin Man. One layer was eliminated, and the fabric was used to build a life raft that would fit in the same package that the original suit came in. Because it is a full body suit, the Mark 10 provides thermal protection once the wearer reaches the surface, and the British Royal Navy has successfully tested it at six hundred foot depths. The navies of twenty-two nations currently use SEIE units of some type. Traditions Insignia Submarine Insignia Further training and qualification at sea are required before submariners are awarded the coveted Submarines insignia ("dolphins" or "fish") – the submarine insignia worn by officers (gold) and enlisted personnel (silver) to demonstrate their achievement. The insignia of the U.S. Navy's Submarine Service is a submarine flanked by two stylized dolphins named Castor and Pollux. The origin of this insignia dates back to June 1923, when Captain Ernest King, USN, Commander, Submarine Division Three (later Fleet Admiral and Chief of Naval Operations), suggested to the Secretary of the Navy that a device for qualified submariners be adopted. He submitted a pen-and-ink sketch as an example. A Philadelphia firm, Bailey, Banks and Biddle, was requested to design a suitable badge. In 1928, a member of that firm told Ensign William C. Eddy that they were looking for a design. Eddy, using sketches of the 1926 Naval Academy class crest that he had designed, presented the submarine insignia which is used to this day. In 1941 the Uniform Regulations were modified to permit officers and enlisted men to wear the submarine insignia after they had been assigned to other duties in the naval service, unless such right had been revoked. The officer insignia was a bronze gold-plated metal pin, worn centered above the left breast pocket and above the ribbons or medals. Enlisted men wore an embroidered silk insignia on the