For the landing of marines, it is necessary to reconnoiter the coastal zone for mines, clear mines and prepare passages, and this is the core work of the Navy Seals,
The Dry Combat Submersible (DCS) is a type of SEAL Delivery Vehicle (SDV) that maintains a dry microclimate, allowing special forces personnel to arrive at the scene more rested than when using a conventional submersible, which requires them to remain fully equipped with diving gear. Special forces personnel exit the submersible to carry out their mission.

MSUBS has developed a number of DCS:
● S301/S301i 8-person all-electric DCS, proof of concept, operated by USSOCOM as UOES1
● S351 Nemisis 10-person all-electric DCS demonstrator, operated by USSOCOM as UOES2
● DCS 10-person all-electric DCS production model for USSOCOM
● S361 10-person all-electric DCS export model
● S302 8-person all-electric DCS for export
● S303 compact 8-person all-electric DCS, small enough to fit in a dry deck shelter (DDS)
● S401 large 18-person DCS with AIP fuel cell or diesel-electric options