Here are 10 facts about the country’s ambitious defence project:

1.    In October 2005, India placed an order for six Scorpene-class attack submarines.
2.    Construction of the first Scorpene submarine began in December, 2006 with technical help and equipment from French companies DCN and Thales.
3.    As of 2016, the submarines are being built at the Mazagon dockyard in Mumbai.

4.    The total cost of the submarines is estimated to be Rs 235.6 billion ($3.75bn).
5.    The submarine can stay out to sea for 50 days.
6.    The Scorpene has two diesel engines that generate 1,250kW of power and electric motor which generates 2,900kW of power.
7.    The submarine is a scaled-down version of France's 4,700-tonne Barracuda submarine and equipped with full rescue and safety systems.

8.    The 1600-tonne submarine can hold a total company of 31 men.
9.    Two variants of Scorpene submarine are currently available: The CM-2000 and the AM-2000.
10.   French Navy, Brazilian Navy, Malaysian Navy, and Chilean Navy operate SSK Scorpene class attack submarines.

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