INS Shalki is a Shishumar-class diesel-electric submarine of the Indian Navy. The submarine was the first ever submarine to be built in India and launched in 1987 by the late PM Rajiv Gandhi.
Where was India's first submarine base 'Virbahu' commissioned in 1971 ?
(A) Mumbai (Maharashtra)
(B) Kochi (Kerala)
(C) Visakhapatnam (A.P.)
(D) Port Blair (A.& N.Islands)