They were powered by diesel engines and batteries. The batteries were for underwater use and the diesels propelled the sub and charged the batteries while running on the surface.
Argentina had diesel-electric submarines while the British had nuclear-powered submarines.
Nuclear Energy
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All submarines have storage batteries. Diesel-electric boats like the ones used during World War II are still used by the navies of some countries. Nuclear-powered submarines also have storage batteries that are used as a backup power supply if and when the sub loses the use of its steam-powered electric generators.
Nuclear submarines are powered by a nuclear reactor and they are completely independent of air, so there is no need to surface frequently.
The PLA navy has more than 225,000 personnel and is thought to have as many as 70 submarines, 10 of them nuclear-powered
USA. nuclear powered submarines can go faster than 25 knots (nautical miles per hour) underwater.
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The Los Angeles class submarine is nuclear powered.
It is doubtful. Canada has never had nuclear powered ships or subs. the current submarines (victoria class) were acquired from the UK and are desiel powered. Canada does not have any plans in the future for any nuclear power vessels.
Only a few British submarines were involved landing advance recconnaisance soldiers during the early days of June 1944.