SUBMARINE TENDER

A 'submarine tender' is a type of ship that supplies and supports submarines.
Submarines are relatively small compared to most oceangoing vessels, and generally do not have the ability to carry large amounts of food, fuel, torpedoes, and other supplies, nor to carry a full array of maintenance equipment and personnel. The tender carries all these, and periodically meets up with a submarine at sea to replenish it. In some navies the tenders were equipped with workshops for maintenance and as floating dormitories with relief crews.
Unable to operate conventional tenders the Germans utilised Type XIV submarines "milchcows" as tenders.
With the increased size and automation of modern submarines, plus their reliance on nuclear power, tenders are no longer as necessary as they once were.
In the United States Navy, submarine tenders are considered auxiliaries, with hull classification symbol "AS". As of 2006, the Navy only maintains two such tenders, ''Emory S. Land'' (AS-39) and ''Frank Cable'' (AS-40).
The Russian Navy had decommissioned all its ''Ugra'' class tenders inherited from the Soviet Navy by 2001. The last remaining ship of this class was the INS ''Amba'' (A54), which was sold to the Indian Navy in 1968 for use with their fleet of ''Foxtrot'' class submarines. She was reportedly decommissioned from service in July 2006.