At present, 43 nations have over 600 submarines

The INS Sindhurakshak tragedy has brought the focus on the mysterious world of submarines. Here are some interesting submarine facts.

When was submarine first used in war?

By early 18th century, many inventors made several designs of naval vessels that could travel on the surface as well as beneath water. The American Revolution was the first war that witnessed military deployment of such boats.

Submarines were also used during the American civil war. Submarines equipped with torpedo became a major factor during the First and the Second World War. According to US navy at present there are 43 countries operating over 600 submarines.

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