Defense Department Plans for an Underwater Express

The Defense Advanced Research Projects Office (DARPA) has initiated an underwater express program to "demonstrate stable and controllable high‑speed underwater transport through supercavitation. The intent is to determine the feasibility for supercavitation technology to enable a new class of high‑speed underwater craft for future littoral missions that could involve the transport of high‑value cargo and/or small units of personnel. The program will investigate and resolve critical technological issues associated with the physics of supercavitation and will culminate in a credible demonstration a significant scale to prove that a supercavitating underwater craft is controllable at speeds up to 100 knots."