As of October 2023, India has a total of 15 operational nuclear submarines, which include both ballistic missile submarines (SSBNs) and attack submarines (SSNs). The country operates four SSBNs, known as the Arihant-class, and is in the process of expanding its fleet. Additionally, India has several nuclear-powered attack submarines, enhancing its underwater capabilities. The exact number may vary as new submarines are commissioned or undergo maintenance.
The US, Russia, Great Britain, France, China and (recently) India have nuclear submarines.
The PLA navy has more than 225,000 personnel and is thought to have as many as 70 submarines, 10 of them nuclear-powered
From Wikipedia: Today, six countries deploy some form of nuclear-powered strategic submarines: the United States, Russia, France, the United Kingdom, People's Republic of China, and India Several other countries, including Argentina and Brazil, have ongoing projects in different phases to build nuclear-powered submarines.
15
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230
170
USA has the most nuclear submarines
nearly 155
As of October 2023, the countries known to possess nuclear submarines include the United States, Russia, China, France, and the United Kingdom. The United States has around 68 operational nuclear submarines, while Russia has approximately 60. China operates around 12, and both France and the United Kingdom have about 10 each. India is also developing its nuclear submarine capabilities and has launched its first operational vessel.
Argentina had diesel-electric submarines while the British had nuclear-powered submarines.
Reactors power submarines and many surface ships. Nuclear weapons.