The Navy stated a requirement for six boats, but that was established before it decided to convert four Ohio-class ballistic missile submarines to guided-missile submarines (SSGNs) with the additional mission of support of special operations forces. Competitive conceptual designs were developed in the late 1980s, the Request for proposal was issued in 1993, and the first contract for design and construction of the ASDS was awarded in 1994. The first study to define the ASDS was performed in 1983. The primary limitation on the SDV's range is not fuel or batteries but water temperature, as Navy SEALs can only stay in cold water for so long, even with wetsuits. It was designed to replace the wet SEAL Delivery Vehicle (SDV), which exposed combat swimmers to long, cold waits during transit that impeded combat readiness on arrival, limited operational range, and hindered underwater navigational capability. Mission ĪSDS was conceived to address the need for stealthy long-range insertion of special operations forces on covert or clandestine missions. As of 2019, the Navy plans to replace the ASDS with the Dry Combat Submersible, a similar midget submarine being developed by Lockheed Martin. The ASDS was canceled in 2009 due to cost overruns and reliability issues, after the prototype was destroyed in a fire in 2008. It provided stealthy submerged transportation for United States Navy SEALs from the decks of nuclear submarines for use as an insertion platform for covert and clandestine special operations missions.
The Advanced SEAL Delivery System ( ASDS) was a midget submarine operated by the United States Navy and United States Special Operations Command. Northrop Grumman Electronics Sensors and Systems Division, Oceanic Systems subdivision
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