- SEAL Delivery Vehicle
The SEAL Delivery Vehicle or (SDV) is a manned
submersibleand a type of Swimmer Delivery Vehicleused to deliver United States Navy SEALsand their equipment for special operationsmissions.
SDVs carry a pilot, co-pilot, and combat swimmer team and their equipment to and from maritime mission objectives on land or at sea. The Pilot and co-pilot are often a part of the fighting team. The SDV has compressed air to extend the range of a swimmer's own air tank or rebreather.
The SDV is used primarily for covert or clandestine missions to denied access areas (either held by hostile forces or where military activity would draw notice and objection).
It should not be confused with the larger, dry submersible called the Advanced SEAL Delivery System (
ASDS). The SDV is flooded, and the swimmers ride exposed to the water, breathing from the vehicle's compressed air supply or using their own SCUBA gear. (The ASDS is dry inside, with a full life support and air conditioning system.)
The SDV is lithium-ion battery powered and equipped with propulsion, navigation, communication, and life-support equipment. The Mk 8 Mod 1 SDV can deliver several fully equipped SEALs to the mission area, be "parked" or loiter in the area, retrieve the SEALs, and return home.
The Mark 8 Mod 1 SDV is currently the only SDV employed by US military. Other operational vehicles included the now retired MK 6, MK 7, and the Mk 11.
SDVs are generally launched from a
Dry Deck Shelteron the back of a submarine, or from amphibious carriers (surface craft) equipped to launch and recover the SDV. It can also be air-dropped (unmanned) into an operational area from a C-130 Hercules. [http://www.globalsecurity.org/military/systems/ship/sdv.htm Seal Delivery Vehicle] ]
History - SDV program
The SDV program dates back to World War II and various sleds and vehicles developed for use by the Underwater Demolition Teams. After the war development continued in a garage-shop fashion by various UDT units, and included various "Marks" as the MK V, VII, VII, and XII. Intermediate numbers were assigned to some vehicles that never made it off the shop floor. All were of flooded design. [http://www.sealchallenge.navy.mil/seal/introduction.aspx Introduction to Naval Special Warfare] ] The wet vehicle SDV program (officially named the Swimmer Delivery Vehicle, sometimes erroneously designated as the SEAL Delivery Vehicle after the Swimmer Deliver Vehicle Teams were renamed SEAL Deliver Vehicle Teams) currently centers on the MK VIII MOD 1, was first established in 1975 for use among UDT/SEAL teams. The early MK8 MOD 0 SDVs had a PRC104 UHF ultra high frequency radio for use underway. The newer model MK8 MOD1 has a dual sliding canopy and quick release hatch.
Advanced SEAL Delivery System
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