Why have we been able to build supersonic aircraft but not supeersonic ships?

Supersonic aircraft can achieve speeds greater than the speed of sound due to their streamlined designs and the relatively lower resistance of air compared to water. In contrast, supersonic ships face significant challenges, including immense hydrodynamic drag and shock waves created in water, which can lead to instability and structural integrity issues. Additionally, the energy required to overcome these forces in water is much greater, making it less feasible for ships to achieve and maintain supersonic speeds. Consequently, engineering solutions for supersonic ships remain complex and largely untested.