Related by context. Frequent words. (Click for all words.) 56 submersible 54 AUVs 51 Polarstern 51 Thor Heyerdahl 51 oceanographic survey 51 radar altimeter 51 REMUS 51 hydrofoil 51 rigid inflatable boat 51 unpowered 50 unmanned submarines 50 frogman 50 robotic submarine 50 Spitzbergen 50 barque 50 hydrofoils 49 steel hulled 49 scramjet engine 49 submarine 49 Graf Zeppelin 48 Roald Amundsen 48 Cryosat 48 oceanographic 48 underwater robot 48 Andrea Doria 48 voyaging 48 torpedo tubes 48 submersibles 48 brigantine 48 frogmen 48 inertial guidance 47 sQuba 47 UUV 47 Remora 47 Weddell Sea 47 sonars 47 autonomous underwater 47 upturned hull 47 polar expeditions 47 conning tower 47 rowboat 47 Jacques Cousteau 47 underwater archaeologist 47 ramjet 47 liferaft 47 Svalbard archipelago 47 scanning sonar 47 Nereus 47 masted schooner 47 minesweeping 46 unpiloted 46 unmanned underwater 46 rebreather 46 MARSIS 46 Ariane rocket 46 Mini SAR 46 scow 46 dirigible 46 Emeraude 46 nanosatellite 46 missile frigate 46 Scapa Flow 46 rigid hull inflatable 46 SLBM 45 infrared telescope 45 celestial navigation 45 PlanetSolar 45 crewmen aboard 45 AUV 45 missile frigates 45 MBARI 45 drogue 45 vessel 45 Galileo spacecraft 45 Lake Vostok 45 bow thruster 45 Emergency Position Indicating 45 hydrophone 45 HMS Tireless 45 crewmembers aboard 45 IODP 45 oceangoing 45 Antarctic explorer 45 fiord 45 reusable spacecraft 45 inflatable dinghy 45 ship Ile 44 six wheeled rover 44 divers 44 SCUBA diving 44 motoryacht 44 polar 44 yawl 44 hydrothermal vent 44 scramjet 44 decompression chamber 44 robotic rovers 44 #m #ft [002] 44 Viking landers 44 hydrodynamics 44 polar explorers