Deep Submergence Unit

The **Deep Submergence Unit (DSU)** is a specialized component of the United States Navy focused on undersea rescue and recovery operations. Established in 1971 at Naval Air Station North Island, California, the DSU was created in response to the loss of the submarine USS Thresher (SSN-593) and the need for rapid deep-sea rescue capabilities. The unit has operated and maintained a variety of submersible vehicles, including the Deep Submergence Rescue Vehicle (DSRV), supporting both U.S. and allied submarine rescue missions worldwide. Over the decades, the DSU has played a critical role in advancing deep-sea technology and ensuring the safety of submariners through rigorous training and international collaboration.