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Submarine

Submarine - USS Blueback (SS-581)

A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term submarine most commonly refers to a large crewed autonomous vessel. However, historically or colloquially, submarine can also refer to medium-sized or smaller vessels (midget submarines, wet subs), remotely operated vehicles or robots.
USS Blueback SS-581
SS581 The USS Buleback
USS Blueback (SS-581) is a decommissioned Barbel-class submarine formerly in the United States Navy. She was the second Navy submarine named for a form of the rainbow or steelhead trout found only in Lake Crescent on the Olympic Peninsula in Washington state. The fish lives in deep water and is bluish black along its upper sides and whitish underneath.
Launched on 16 May 1959 ,
Commissioned on 15 October 1959,
Decommissioned on 1 October 1990
She was the last non-nuclear submarine to join the United States Navy and was the final conventionally powered submarine to be decommissioned, leaving the United States Navy with a fully nuclear submarine fleet.
Museum of Science and Industry Portland
Torpedo inside the submarine
United States Navy Submarine
Torpedo :  The modern torpedo is a self-propelled weapon with an explosive warhead, launched above or below the water surface, propelled underwater towards a target, and designed to detonate either on contact with its target or in proximity to it.
Oregon Museum of Science and Industry
USS Blueback Submarine
Submarine USS Blueback in Oregon
Historically, it was called an automotive, automobile, locomotive or fish torpedo; colloquially called a fish. The term torpedo was originally employed for a variety of devices, most of which would today be called mines. From about 1900, torpedo has been used strictly to designate an underwater self-propelled weapon. The original torpedo is a kind of fish.
  
As on today (Nov-2012) India has 16 Submarines.
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