Submarines can see the surface of the ocean with a periscope when they are close to the surface.
A standard viewing device used on a submarine is a periscope.
A submarine's viewing point is called a "periscope." The periscope allows crew members to see above the water's surface while the submarine remains submerged. It typically consists of a series of mirrors and lenses that provide a clear view of the surroundings, enabling navigation and observation without exposing the submarine.
Periscope.
A device for viewing microscopic things.
i think you mean the 'periscope'.
The object used to view the outside from inside the submarine is called a periscope.
A periscope.
scope
Asdic
A submarine is an undersea boat, or submersible.
The Nautilus was Fulton's submarine.
Below