Related by context. Frequent words. (Click for all words.) 62 submersible 57 REMUS 56 submarine 56 robotic submarine 55 unmanned underwater 55 underwater 54 rigid inflatable boat 54 underwater robot 54 autonomous underwater 54 sQuba 53 AUVs 53 submersible robots 53 submersibles 52 submersible robot 52 scanning sonar 51 hovercraft 51 sonars 51 antisubmarine 51 vehicles ROVs 51 MBARI 50 rigid hull inflatable 50 ballistic missile submarine 50 hydrofoils 50 SCUBA diving 50 hydrographic survey 50 multibeam 50 Submersible 50 celestial navigation 50 dirigible 49 Remora 49 airship 49 highly maneuverable 49 radar altimeter 49 AUV 49 Dornier aircraft 49 hovercrafts 49 unmanned submarines 49 underwater sonar 49 ROVs 49 steel hulled 49 towline 48 hydrofoil 48 telescopic camera 48 engineless 48 PlanetSolar 48 Polarstern 48 rebreather 48 hydrophone 48 Thor Heyerdahl 48 zodiacs 48 Aegis destroyer 47 shallop 47 robotic rovers 47 hypersonic speeds 47 autonomous robotic 47 nanosatellite 47 oceanographic survey 47 motherships 47 bathymetric 47 oceanographic 47 inertial guidance 47 workboat 47 Hovercraft 47 unpowered 47 torpedos 47 ROV 47 Andrea Doria 47 SCUBA 47 missile frigate 47 vessel 47 SkySails 46 inflatable rafts 46 laser altimeter 46 robotic rover 46 UUV 46 robotic spacecraft 46 unmanned 46 remotely operated 46 vehicles UAVs 46 scan sonar 46 Beaufort Inlet 46 torpedo tubes 46 ornithopter 46 Wallops Island Va. 46 tidal turbine 46 inflatable boat 46 sonobuoys 46 tidal turbines 46 reusable spacecraft 46 sensor arrays 45 hydrodynamics 45 HL Hunley 45 paddlewheeler 45 minesweeping 45 Helldiver 45 HMCS Athabaskan 45 undersea 45 Spitzbergen 45 foot Boston Whaler 45 rowboat 45 periscope