submarine (undersea boat)

deep sea / the part of the ocean below approximately 200 meters / The former Japanese name of the seaport of Prigorodnoye on the island of Sakhalin, Russia

expedition, exploration

to explore

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

deep-sea fish

explorer (person who by means of travel searches out new information)

everything