a submarine (undersea boat)

torpedo

launch, firing

launch, fire

nuclear submarine

to dive, to submerge

going underwater

(used after an adjective in the te-form) unbearable / unable to lose to; no match for

an enemy / an opponent, a competitor / (historical) the other party in a lawsuit / 的: (historical) in the red-light district, a term of reference used between prostitutes and customers

an enemy / revenge, vengeance / opponent (of the game or conflict) / (archaic, obsolete) marriage partner