A periscope.
To see over walls and in submarines
A Periscope or Radar
periscope
A standard viewing device used on a submarine is a periscope.
Yes sonar can be used at periscope depth. Surface ships also have sonar arrays on them. They are usually used to detect submarines.
PERISCOPE
Periscopes were used to watch and observe and spy on the enemy lines during the war and are still used in submarines
Periscopes were used to watch and observe and spy on the enemy lines during the war and are still used in submarines
The periscope, basically a vertical tube with mirrors inside it.
A periscope is used to observe the surface from a submarine
The Captain used the periscope to locate the enemy ships.A periscope is the eye of a submarine.