That said the biggest advancement since that time was the introduction of nuclear reactors in the mid-1950s. At the time, nuclear fission was becoming more and more popular worldwide.
With a nuclear reactor on board, submarines could patrol the seas for much longer intervals avoid having precious space taken up by fuel and forego many fire and air pollution risks.
Today nuclear submarines are not only the norm but also among the most feared ships in the ocean life on a U.S submarine is not unlike serving aboard any other ship most time is spent actively working or sleeping.
Watch video as below:
