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.
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 captain of the submarine raised the periscope to see if there's danger.
When the submarine is upto 20 meters from the surface they use a periscope which is simply 2 pieces of glass at 45 degrees to each other. similar to the periscope used to view from a trench by the army.
The submarine
The submarine's periscope and radar mast are damaged.
Periscope
Periscope.
red
They use a periscope. See the related link for more information.
i think you mean the 'periscope'.
If you mean in the periscope, two.