INS Arihant is the first of the new Indian Navy submarines.
Two more of the same design are currently being built, to be launched in 2010 1nd 2011 repectively. There are plans to build another two to make five in total.
USS Nautilus
That would be the INS Arihant, -The Indian Navy's first nuclear submarine.
The submarine you are thinking about was the USS Nautilus. It was the world's first nuclear powered submarine and commissioned into the US Navy in 1955
The USS Nautilus (SSN-571) was the US Navy's first nuclear powered submarine.
The world's first atomic powered submarine was the USS Nautilus.
nautilus
The USS Nautilus (SSN-571) was the world's first operational nuclear submarine.
Uss nautilus
India's first submarine was INS CHAKRA nd first nuclear submarine is INS ARIHANT..
ins chakra
USS Thresher
Its "INS Arihant".