Answer:
Periscope
Explanation:
Submarines are navigational machines which are capable of traveling under water. They are made of metal and tight sealed such that water penetrating omis almost impossible. Submarines are sophisticated and are usually used by the military to monitor and perform other naval duties.
Howerver, despite the fact That Submarines navigate below the suface, they have an equipment called the periacipneqhichbenabkes those inside to see and access what is happening on the surface, they use the Periscope.
