Dry deck shelter

A dry deck shelter (DDS) is a removable module that can be attached to a submarine to allow divers easy exit and entrance while the boat is submerged.

The host submarine must be specially modified to accommodate the DDS, with the appropriate mating hatch configuration, electrical connections, and piping for ventilation,[1] divers' air, and draining water.

The DDS can be used to deploy a SEAL Delivery Vehicle submersible, Navy divers, or Combat Rubber Raiding Craft (CRRC).

[3] [4] Training is conducted at the purpose-built Chalfont Shore Facility (CSF) constructed by BAE Systems at HMNB Clyde.

[8] The shelters are maintained by a combined effort of Navy divers stationed on the teams and workers of the maintenance company Oceaneering International.

USS Dallas (SSN-700) departs Souda Bay harbor with dry deck shelter attached in 2004.
A pair of rigid-hulled inflatable boats operate alongside USS Archerfish during a 1993 exercise. Archerfish has a dry deck shelter attached to its deck.
A SEAL Delivery Vehicle (SDV) is loaded aboard the Dry Deck Shelter on the Los Angeles-class fast attack submarine USS Dallas