The two battleships sank in only a few feet of water and were subsequently re-floated. Nevertheless, they were out of action for over a year. Bathyscaphe Trieste was first to explore the Challenger Deep of the Mariana Trench CA type First series was a 2-man midget submarine the second series carried a crew of three.[26] CB type 45 ton 4 man design first introduced in 1941[26] CE2F/X100 post-war torpedo chariot MG 120: MG 120 Shallow water attack submarine (SWATS) is a development of MG 110 in Pakistani service with the displacement is increased to 130 t submerged, range is 1600 nmi @ 7 kn surfaced, 60 nmi @ 4.5 kn submerged, and the number of divers carried is drastically increased to 15.[27] MG 130: MG 130 is a development of MG 120 with AIP module called UAPE (Underwater Auxiliary Propulsion Engine) based on a closed circuit diesel fueled by liquid oxygen, which provides an underwater range of 400 nmi (740 km).[27]