Sneakily approaching the unsuspecting.
Under water.
Half-whale,
And half-machine.
Scanning the environment with its laser eyes.
A bathyscaphe
Powered by souls of sailors who died.
https://www.youtube.com/watch?v=QL_UjcXUOgQ
Answered: A bathyscaphe is a deep sea diving submersible
Where is the metal base to fix propeller on the bathyscaphe?
Bathyscaphe Trieste - bartleby