Arihant class submarines, India's first indigenously developed nuclear capable submarines, were built under the Advanced Technology Vessel (ATV) project. This project was funded by

Arihant class vessels are India's first indigenously designed and built nuclear submarine. They were developed under the US$2.9 billion Advanced Technology Vessel (ATV) project to design and build nuclear-powered submarines. The lead vessel of the class, INS Arihant, is set to be launched for trial by the Indian Navy. Four vessels of the class are under development and expected to be in commission by 2015.