The Ukrainian Magura V5 naval drones have proven to be fast, deadly, and cheap. As we posted last August, Ukrainian naval drones are redefining warfare in the Black Sea; quite an accomplishment for a beleaguered nation that almost wholly lacks a navy.
Recently, Northrop Grumman revealed an underwater drone named the Manta Ray. The drone, built for the Defense Advanced Research Projects Agency (DARPA). The drone has been under development since 2020. The Manta Ray represents a new class of unmanned underwater vehicles (UUVs), that were developed to perform long-duration, long-range military missions with as little human oversight as possible. The craft is also capable of harvesting energy from the ocean.