A number of submarines have been modified for Special Operations to carry Dry Deck Shelters (DDSs) and/or Advanced Seal Delivery Systems (ASDS) for the deployment of US Navy SEALs and their equipment from inside the submarine.
The DDS is 9 feet wide and 38 feet long. Each unit consists of 3 compartments; a hyberbarick chamber; a transfer trunk and a hanger for a Swimmer Delivery Vehicle (SDV) or up to 20 Special Operations Forces (SOF) personnel with Combat Rubber Raft Crafts (CRRCs). With the submarine still submerged, SEALs can exit the DDS and ascend to the surface with their equipment or they can exit using a SDV and travel under water several miles to their objective area.
The ASDS is 65 feet long and is a long-range submersible which provides the capability to deliver special operations forces for clandestine missions. It is piloted by a crew of two and can carry up to 16 SEALs. SEALs exit the submarine using the ASDS and then are delivered to their destination.
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