underwater
armed
armor
army
atomic
battle
battleship
blue
boat
cruiser
deep
defense
floating
force
horizon
marine
maritime
metal
military
missile
mission
nautical
naval
navy
nuclear
ocean
periscope
power
russian
sailing
sea
security
ship
sink
sinking ship
stealth
steel
submarine
submerge
torpedo
transportation
vehicle
vessel
war
warfare
warship
water
wave
weapon