Advanced SEAL Delivery System

ASDS attached to the USS Greeneville
Class overview
NameAdvanced SEAL Delivery System (ASDS)
BuildersNorthrop Grumman Electronics Sensors and Systems Division, Oceanic Systems subdivision
Operators United States Navy
Preceded bySEAL Delivery Vehicle
Succeeded by
Cost$885 million (overall)[1]
Built1996–2000
In commissionJuly 2003 – November 2008
Planned6
Completed1
Cancelled5
Lost1
General characteristics
TypeSubmersible
Displacement60 long tons (61 t)
Length65 ft (20 m) o/a
Beam6 ft 9 in (2.06 m)
Draft8 ft 3 in (2.51 m)
Propulsion
  • 67 hp (50 kW) electric motor
  • Lithium-ion battery
  • Single propeller
Speed8 knots (15 km/h; 9.2 mph)
Range125 nmi (232 km)
Test depthClassified, >150 ft (46 m)
Troops16 SEALs
Crew2
Sensors and
processing systems
Forward- and side-looking sonar

The Advanced SEAL Delivery System (ASDS) was a midget submarine operated by the United States Navy and United States Special Operations Command. 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 ASDS was canceled in 2009 due to cost overruns and reliability issues, after the prototype was destroyed in a fire in 2008. As of 2019, the Navy plans to replace the ASDS with the Dry Combat Submersible, a similar midget submarine being developed by Lockheed Martin.[2]

  1. ^ Cite error: The named reference GAO was invoked but never defined (see the help page).
  2. ^ McRaven, William (14 March 2015). Hearing on National Defense Authorization Act for Fiscal Year 2015 and Oversight of Previously Authorized Programs Before the Committee on Armed Services, House of Representatives, One Hundred Thirteenth Congress, Second Session (PDF). Subcommittee on Intelligence, Emerging Threats and Capabilities Hearing on Fiscal Year 2015 National Defense Authorization Budget Request from the U.S. Special Operations Command and Posture of the U.S. Special Operations Forces. Washington, DC: Government Printing Office. Retrieved 23 January 2019.

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