Calc GaoGaiGar vs Betterman - Betterman Aqua's swimming speed

Earth — seventy percent of its surface is covered by ocean. The shadow of a giant white fish glided through its waters, almost melting into them. Correction: it was not a fish. It was going at a speed of several hundred knots. Hundreds of times faster than the fastest marine creature and tens of times faster than a nuclear submarine, the culmination of human science, this extraordinary value surpassed anything else of its class. However, this was merely the outcome of it adapting to the deep. The identity of the shadow was the Somnium Lamia, changed into Betterman Aqua. At that point in time, his super-senses had picked up on what was happening at the other end of space. As the flowing seawater coursed over him, Lamia had a prediction.

This event is the beginnings of a battle that I will be engaged in, eleven years from now–

The battle against the King of Ruin, with the survival of all beings hanging in the balance — in this moment, Lamia resigned and resolved himself to it.

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Betterman Aqua can swim hundreds of times faster than the fastest marine creature and tens of times faster than a nuclear submarine. The highest confirmed speed of a marine creature is actually not that much lower than the highest confirmed speed of a nuclear submarine (although there are said to be reports on faster nuclear submarines, but the results are unknown due to the secretive nature of the submarines; there are also debates about the fastest marine creatures too), the creature in question being the sailfish, which can move at over 35mph (or 15.6464m/s). As it says hundreds of times, we'll go with 200 for our low end and 900 for our high end.

(Low end)
T = 15.6464 X 200
= 3129.28/340.29
= Mach 9.19592113

(High end)
T = 15.6464 X 900
= 14081.76/340.29
= Mach 41.3816451

Final Results
Betterman Aqua's swimming speed (low end) = Mach 9.196
Betterman Aqua's swimming speed (high end) = Mach 41.382

To make this even more impressive, this happens underwater where resistance is much greater.