In the vacuum of space, where there is no air or medium to transmit sound waves, there would be no sound. Sound requires a medium, such as air, water, or solids, to propagate. Since space is a near-vacuum with extremely low particle density, there would be no molecules or particles to vibrate and transmit sound waves.
Therefore, if you were traveling through space at the speed of sound (Mach One), you would not hear any sound at all. It would be completely silent.