Can you go supersonic under water?

No, you cannot go supersonic underwater in the same way as in air. Supersonic speed refers to traveling faster than the speed of sound, which is approximately 343 meters per second (1,125 feet per second) in air at sea level. However, in water, the speed of sound is much higher, around 1,480 meters per second (4,869 feet per second) at room temperature. Thus, achieving supersonic speeds in water would require exceeding this higher threshold, which is not feasible with current technology for any object or vehicle.