Periscope.
The object used to view the outside from inside the submarine is called a periscope.
The captain of the submarine raised the periscope to see if there's danger.
The submarine
The submarine's periscope and radar mast are damaged.
Periscope
red
If you mean in the periscope, two.
i think you mean the 'periscope'.
In paintball wars, a periscope is a handy way to look around a corner without getting shot. With only its periscope out of the water, a submarine was nearly impossible to spot at a distance.
The periscope of a submarine is located in the sail, also known as the conning tower. This structure is situated above the main hull and contains various equipment, including the periscope, which allows submariners to observe the surface while the submarine remains submerged.
Periscopes allow a submarine, when submerged at a shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull.