Depends on what class of Submarine you are talking about.
Balistic Submarines are a nuclear deturent that assures retaliation in the event of a country using nuclear weapons against one another.
Attack Submarines have grown a lot since WWII. They are now capable of conducting Anti-Surface Warfare, Anti-Submarine Warfare, Land Attack Strikes, Harbor Mining, Speacial Forces Insurcian & Extraction, & Intelligance Gathering.
Scientific Research Submarines are used for Biological Research, Search and Recovery of Shipwrecks.
Submarines todaee are used for underwater exploration,funn,new life underwater.
Nuclear energy is used to power most modern submarines
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The Germans have used submarines in the Atlantic at various times in the past, including today. Atlantic submarine activity was a key theater of both World War I and World War II.
Submarines typically use air tanks. Oxygen is very dangerous and very flammable. It's use is very limited on submarines for that reason.
submarines and bats both use sonar. Calvin was here
Submarines are still used by many navies to watch other navies ships and to protect coastlines secretly.
Most Are Used For Spying And Stuff.
oceanographers use submarines to take pictures of sea life and things that have been found or things that they are looking for.
The marines do not use submarines. Only the Navy does.
The Royal Navy Operates 6 Trafalgar class submarines and 1 Astute class. These submarines are called 'attack' or 'hunter-killer' submarines and have roles such as land attack using Tomahawk cruise missiles and anti-surface and anti-submarine roles using the Spearfish torpedo. They can also carry out surveillance and reconnaissanse. The Royal Navy also has 4 Vanguard class submarines. These submarines are ballistic missile submarines. These submarines are responsible for the UK's nuclear detterent and use the Trident missile system. There is always at least one of these boats at sea at any given time.