A wet sub is a type of underwater vehicle, either a submarine or a submersible, that does not provide a dry environment for its occupants. It is also described as an underwater vehicle where occupants are exposed to ambient environment during operations. The watercraft is classified as medium-sized or small vessel.
Usually, scuba divers ride outside the device as one would ride a motorcycle or in a semi-enclosed opening like a kayak or bobsled, although it can be designed to fully enclose its occupant(s) to reduce drag. An enclosed vehicle may also provide a dry viewing chamber for the occupant(s). The sub is generally propelled by an electric motor and is battery powered. The depth and endurance is typically limited by the requirements of the divers, particularly water temperature and breathable air.
Wet subs have been used to transport and deploy special operations forces in waters too shallow for an ordinary submarine, lay mines (particularly for attaching limpet mines directly to a ship), firing torpedoes, or gathering intelligence in harbors. They have also been used to plant listening and recording devices on undersea cables in Operation Ivy Bells. For military use, the operator will sometimes use a rebreather device so as not to leave a trail of bubbles. Military wet subs are deployed from a larger submarine or from a surface ship. The SEAL Delivery Vehicle (SDV) used by the United States Navy SEALs and British Special Boat Service is an example that is in use today. The SDV is used to insert Navy SEALs in shallow coastal waters or attack surface ships 
A wet sub is attractive to the amateur or small commercial builder since many of the problems associated with a dry sub are avoided as only the propulsion and power systems need to be waterproof and life support is much less of an issue than it is with a sealed occupant chamber. Complete submarines of this type are also available commercially.
Wet sub designs are often used for human-powered submarines because they are smaller and lighter than dry submarines. An example is the pedal-operated wet-sub called "the Scubster", which is powered by a twin propeller connected to the pedal belt.
|Wikimedia Commons has media related to Wet submarines.|
- Military wetsubs
- Commercial wetsubs
- Custom wetsubs
- Needham, Robert (2012). Team Secrets of the Navy SEALs: The Elite Military Force's Leadership Principles for Business. Skyhorse. ISBN 978-1-62087-326-7.
- Chandar (Retd.), Col Y. Udaya (2017-04-24). The Modern Weaponry of the World's Armed Forces. Notion Press. ISBN 978-1-946983-79-4.
- Sutton, H. I. (2016-05-05). Covert Shores: The Story of Naval Special Forces Missions and Minisubs (2nd ed.). CreateSpace Independent Publishing Platform. ISBN 9781533114877.
- Introduction to Naval Special Warfare Archived 2008-01-16 at the Wayback Machine
- "SEAL Delivery Vehicles". National Navy UDT-SEAL Museum. Retrieved 4 September 2018.
- Brueggeman, Peter (1997-12-31). "Scientific Bibliography on Human Powered Submarines, through 1997" (PDF). UC San Diego Bibliography.
- "French engineers test pedal-boat submarine". Reuters. 2010-07-29. Retrieved 2020-04-28.
- "Submarine Races Sail into Carderock Once Again". Naval Surface Warfare Center, Carderock Division Public Affairs. Retrieved 2020-02-06.
|This military-related article is a stub. You can help Wikipedia by expanding it.|
|This article about a type of ship or boat is a stub. You can help Wikipedia by expanding it.|