Related by context. Frequent words. (Click for all words.) 47 Helldiver 47 frogmen 46 submarine 46 reconnaissance satellites 45 minesweeping 45 Langewiesche 44 mine sweepers 43 Varyag 43 spy satellites 43 unmanned 43 frogman 43 unmanned Predator drone 43 reusable spacecraft 42 Soviets 42 robotic submarine 42 helos 42 submersible 41 covert operatives 41 sunken ships 41 REMUS 41 submersibles 41 unmanned underwater 41 warship 41 warships 41 fighter jets scrambled 41 unmanned submarines 41 Chilingarov 41 Crewmen 41 U 2s 41 covert ops 41 Aegis radar 41 submarine warfare 40 spy 40 Akula class 40 submarines 40 naval frigate 40 spies 40 Thor Heyerdahl 40 unseaworthy 40 sunken vessels 40 sunken ship 40 crewmen 40 torpedo 40 torpedo tubes 40 sonars 40 reconnaissance 39 pilotless drone 39 spymasters 39 AWACS 39 crewmen aboard 39 Declassified 39 radar evading 39 secretly 39 Underwater robots 39 coastguard vessels 39 robotic submarines 39 robotic spacecraft 39 Colombian drug cartels 39 seabed 39 Neustrashimy 39 Harpoon missiles 39 hydrographic survey 39 shipwreck 39 manned spacecraft 39 sunken 39 remotely piloted aircraft 39 missle 39 Somali pirates hijack 39 resupply missions 39 Nerpa 39 Somali pirates seize 39 Unmanned Aerial Vehicle UAV 39 Aegis destroyer 39 AUVs 39 submariners 39 torpedos 39 Sea Shepherd vessel 39 HMAS Sydney 39 destroyer escort 39 minesweepers 38 sunken treasure 38 Galileo spacecraft 38 Cold War relic 38 maritime reconnaissance 38 ballistic missile submarine 38 Kormoran 38 LSTs 38 unmanned aerial drones 38 predator drones 38 MBARI 38 sinkings 38 underwater archaeologist 38 Whydah 38 Volkoff 38 Navy diver 38 HMS Vanguard 38 covert CIA 38 Spy Satellite 38 incoming ballistic missiles 38 Nostromo 38 pipelay