The term actually is a sailor's nickname, and is derived from the old WWI/WWII submarines. Prior to the advent of Nuclear Power which allowed for unlimited potable water production, submarines carried a limited supply of water to sea with them, and that was primarily used for drinking water and basic sanitation. Luxuries like showers were few and far between, and the cramped, hot living conditions aboard those boats led to some pretty smelly sailors after several weeks.
Even today, though there is plenty of water available aboard, the smell from the various chemicals used aboard tends to permeate clothing, leading to its own unique smell among submarine crews.
Submariners.
Submariners.
Pigboats. Try living in a Van (vehicle) for a week without ever getting outside of it. Going the restroom (hygiene), no bath or shower, rotting food, dirty clothing, after TWO days it would be a PIGVAN.
U-boat
They are called submarines
No.
submarines are important because people need to go under the sea and do what they got to do to save the world
Yes, they had crews.
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Many early submarines were failures. However, as many countries in the world now own and even build submarines, we could reasonably call them a success.
Ships would form a convoy in an attempt to reduce their vulnerability to enemy submarines.
A standard viewing device used on a submarine is a periscope.