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Firstly, I assume the question refers to Mach 2, not March 2, which could be a marching at double time.

Mach2 is not a speed as such. It is the ratio of the speed of an object through a medium relative to the speed of sound in the same medium. Now sound travels faster in water than in air. So Mach2 in water will be faster than Mach2 in air.

As an extreme, the speed of sound in vacuum is 0 so Mach2 in vacuum will be 2*0 = 0!

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