A deep-submergence vehicle (DSV) is a deep-diving crewed submersible that is self-propelled. Several navies operate vehicles that can be accurately described as DSVs. DSVs are commonly divided into two types: research DSVs, which are used for exploration and surveying, and DSRVs, which are intended to be used for rescuing the crew of a sunken navy submarine, clandestine (espionage) missions, or both. DSRVs are equipped with docking chambers to allow personnel ingress and egress via a manhole.
Historical deep-submergence vehicles
DSV Limiting Factor of Triton Submarines during sea trials
Ictineu 3 inside a warehouse in Sant Feliu de Llobregat, Catalonia, Spain.
Deep-submergence rescue vehicle
A deep-submergence rescue vehicle (DSRV) is a type of deep-submergence vehicle used for rescue of personnel from disabled submarines and submersibles. While DSRV is the term most often used by the United States Navy, other nations have different designations for their equivalent vehicles.
The US Navy's DSRV-1 Mystic docked to a Los Angeles-class attack submarine
Forum Energy Technologies (FET) built LR-7 being retrieved by The Chinese navy submarine rescue ship Changdao
The Italian Navy rescue vehicle SRV-300 launched from the Italian salvage ship Anteo
Indian Navy DSRV launched from a salvage ship
