A body can exceed 3/4 the speed of light in water, particularly weakly interacting particles like neutrinos, which remain largely unaffected by their environment. This phenomenon leads to the emission of Cherenkov radiation, similar to a sonic boom for sound. Cherenkov radiation occurs at a specific angle relative to the particle's trajectory. The discussion highlights the unique behavior of particles traveling at relativistic speeds in a medium. Understanding these effects is crucial in fields like particle physics and astrophysics.