While the earliest submarines can't compare in size to the most modern iterations ... The I-400 remained the largest submarine ever built until the nuclear-powered boats of the 1960s emerged.

Armed with nuclear missiles, the USS Growler acted as a deterrent to keep other nations from using their nuclear weapons ...

A second Indian submarine capable of launching nuclear missiles was commissioned ... K-4 missile," Sutton noted. In comparison with the K-15, the K-4 is a full-size submarine-launched ballistic ...

Commissioned in 1954, the USS Nautilus was the world's first nuclear-powered submarine ... I was amazed by the size of the submarine. As I climbed aboard, the deck provided gorgeous views of ...

Since that first test, the nation has fast-tracked its nuclear ... submarines. All are powered conventionally, including the newly-added Romeo-Mod-class that is the Hero Kim Gun-Ok. For comparison ...