Nuclear-powered Submarines
The United States Navy operates the largest fleet of nuclear submarines. Only the United States Navy, the Royal Navy of the United Kingdom, and France's Marine Nationale field an all-nuclear submarine force. By 1989, there were over 400 nuclear-powered submarines operational or being built. Some 250 of these submarines have now been scrapped and some on order cancelled, due to weapons reduction programs. Russia and the United States had over one hundred each, with the United Kingdom and France fewer than twenty each and China six. The Indian Navy launched their first indigenous Arihant class nuclear-powered submarines on 26 July 2009. India is also reported to be leasing two additional nuclear submarines from Russia.
Nuclear-powered submarines can stay submerged for up to 400 days if the vessel is fully loaded.
Read more about this topic: Nuclear Navy