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A periscope.
A standard viewing device used on a submarine is a periscope.
Submarines can see the surface of the ocean with a periscope when they are close to the surface.
A group of German submarines is called a Wolfpak.
The submarines were either called "submarines" or "U-boats." The German submarine was called the "U-boat"
Submarines don't have windows, at least not any that are used for viewing outside of the hull while submerged. They are used in some submarines as bridge viewing windows, but they're subjected to ambient sea pressure when the boat submerges, not direct sea pressure like the hull is.
Germany called there submarines U boats
A group of German submarines is called a Wolfpak.
NO, they are called 'submariners' .
Submarinology.
As far as civilian submarines, technically no, as tourist submarines aren't actually transporting from point A to point B. For military submarines, absolutely. People using submarines as transport vessels are Special Forces (e.g., SEAL's), Navy research scientists (Polar Expeditions), and other individuals designated as required.
Engineers.