Awet sub is a type of underwater vehicle, either asubmarine or asubmersible, 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.[1] The watercraft is classified as medium-sized or small vessel.[2] This type of submarine differs from other underwater personal transport devices by the fact that it has a hull around it and it is not a "bare bones" design.
Usually,scuba divers ride outside the device as one would ride amotorcycle or in a semi-enclosed opening like akayak orbobsled, 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.[3]
Wet subs have been used to transport and deployspecial operations forces in waters too shallow for an ordinary submarine, lay mines (particularly for attachinglimpet mines directly to a ship), firetorpedoes, or gather intelligence in harbors. They have also been used to plant listening and recording devices on undersea cables inOperation Ivy Bells.[4] For military use, the operator will sometimes use arebreather device so as not to leave a trail of bubbles. Military wet subs are deployed from a larger submarine or from a surface ship. TheSEAL Delivery Vehicle (SDV) used by theUnited States Navy SEALs andBritish 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.[5]
_prepare_to_launch_one_of_the_team%2527s_SEAL_Delivery_Vehicles_(SDV)_from_the_back_of_the_Los_Angeles-class_attack_submarine_USS_Philadelphia_(SSN_690).jpg)
TheMotorised Submersible Canoe, developed by the BritishSpecial Operations Executive duringWorld War II, is another example.
SEAL Team Six used two wet subs to reach the North Korean shore during the2019 SEAL Team Six operation in North Korea.[6]
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.[7] An example is the pedal-operated wet-sub called "the Scubster", which is powered by a twin propeller connected to the pedal belt.[8]
Every two years, a human-powered submarine race takes place at the Naval Surface Warfare Center inBethesda, Maryland.[9]
Military wetsubs
Commercial wetsubs
Custom wetsubs
