Type 7103 DSRVs Osprey class submersibles Sea Pole class bathyscaphe Dragon class bathyscaphe Harmony class bathyscaphe Mobile diving bell QSZ-II submersible Aurora class one-person midget submarine: Aurora (Shuguang, 曙光) midget sub is a Chinese civilian midget sub developed by private firm Wuhan (武汉张五一船舶厂).[4] Length: 3.6 m, beam: 1.8 m, height: 1.2 m, maximum speed: 20 km/hr, endurance: 10 hr maximum, maximum depth: 20 m.