What You Need to Know: Australia, a key U.S. military ally, has faced challenges in modernizing its navy, particularly its submarine fleet. In 2003, the HMAS Dechaineux, a Collins-class submarine, ...

Here’s What You Need to Remember: Thanks to nuclear propulsion, Arihant can do twelve to fifteen knots on the surface and twenty-four knots underwater. Maximum diving depth is unknown, and probably a ...