Do submarines have contact with the outside world?

VLF radio waves (3–30 kHz) can penetrate seawater to a few tens of meters and a submarine at shallow depth can use them to communicate. If two-way communication is needed, the boat must ascend nearer to the surface and raise an antenna mast to communicate on higher frequencies, usually HF and above.

How do submarines communicate with the outside world?

An underwater transmitter uses an acoustic speaker pointed upward to the surface. The transmitter sends multichannel sound signals, which travel as pressure waves. When these waves hit the surface, they cause tiny vibrations.

Can a submarine operate underwater in a river?

It depends on the river, and the definition of “operate.” If “operate” means moving on the surface, then yes, as long as there’s enough depth (modern submarines have a deep draft). For example, Subase New London, in Connecticut, is on the Thames River, so submarines “operate” there every day.

How do submarines use their periscopes?

Submarines have only periscopes for outside vision, and those are only used close to the surface, a periscope depth (PD). Submariners can look around 360 degrees with the periscope to find other ships and aircraft in the area and to gain information on a target they plan to attack or shipping to avoid.

Do Navy submarines have windows or portholes?

No, Navy submarines don’t have windows or portholes so the crew can watch undersea life. Submarines have only periscopes for outside vision, and those are only used close to the surface, a periscope depth (PD).

Can you feel the waves on a submarine when underwater?

Can you Feel the Waves on a Submarine When it’s Under the Water? Normally, a submerged submarine will not rock with the motion of the waves on the surface. It is only in the most violent hurricanes and cyclones that wave motion reaches as much as 400 feet below the surface. In these conditions, submarines can take a five to ten-degree roll.