Manned Combat Submersible

More Than 50 Years of Dry Manned Submersible Experience

Lockheed Martin teamed with Submergence Group, LLC to develop and with Germanischer Lloyd to commercially classify the S301i dry manned submersible. Lockheed Martin and Submergence Group then completed development of the next generation vehicle designated S302. Both vehicles are dry submersibles that support two operators (pilot and navigator) plus up to six swimmers with the ability to lock them out and in. The dry one-atmosphere environment of these vehicles provides an alternative to traditional wet submersibles being used by the U.S. and international Special Forces communities today, and will deliver operators to their destination in better physical condition to complete a mission.
The S302 Design Draws Heavily on Operationally Proven S301i Hardware, has Improved Hydrodynamics and Propulsion that Add to its Overall Performance Upgrades.
The vehicles come with an Inertial Navigation System (INS) and Doppler Velocity Log (DVL) for navigation support, an Underwater Telephone (UWT) and UHF radio for communications, and an obstacle avoidance sonar and fathometer. Additional sensors can be added to support specific mission requirements. The S302 design draws heavily on the operationally proven S301i hardware and has improved hydrodynamics and propulsion that contribute to its overall performance upgrades.
The S301i is available for lease or sale and S302 availability will depend on customer requirements. Lockheed Martin and Submergence Group will ship a commercially classified vehicle to the customer’s desired location and prepare it for operation. With each vehicle, Lockheed Martin and Submergence Group can operate, provide on the job operator training as required, and maintain the vehicle for the period of the lease, or support all logistics requirements for vehicles purchased by U.S. or international customers. Lockheed Martin and Submergence Group are also able to support operational evaluations as requested by the customer.


  S301i S302
Length 24 ft (7.25 m) 31 ft (9.36 m)
Beam 7.7 ft (2.34 m) 7.7 ft (2.34 m)
Height 5.8 ft (1.75 m) 7.7 ft (2.34 m)
Crane Weight 28,000 lbs (13,000 kg) 28,000 lbs (13,100 kg)
Loaded Weight 29,500 lbs (13,380 kg) 31,000 lbs (14,000 kg)
Complement 2 Pilots + 6 Divers 2 Pilots + 6 Divers
Depth Rating 328 ft (100 m) 328 ft (100 m)
LIO* Max Depth 98 ft (30 m) 98 ft (30 m)
Payload Variable Variable
Endurance 24 hrs 24+ hrs
Range 45+ nm at 3 knots 60+ nm at 5 knots
Speed Cruise 3-5 kts; Max 7.5 kts Upon request
*Lock In and Out    
Latest News   ___
The Economic Contribution of Lockheed Martin to Australia
Jun 24, 2018
The Economic Contribution of Lockheed Martin to Australia
U.S. Navy Awards LM for Engineering Services on AN/BLQ-10
Apr 22, 2019
Press Release
Lockheed Martin Awarded $20 Million For Engineering And Technical Services For The U.S. Navy’s AN/BLQ-10 System
Contacts   ___