Is it a real Submarine? A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as "boats" rather than "ships" irrespective of their size.
Although experimental submarines had been built before, submarine design took off during the 19th century, and they were adopted by several navies. Submarines were first widely used during World War I (1914–1918), and are now used in many navies large and small. Military uses include attacking enemy surface ships (merchant and military), or other submarines, aircraft carrier protection, blockade running, ballistic missile submarines as part of a nuclear strike force, reconnaissance, conventional land attack (for example using a cruise missile), and covert insertion of special forces. Civilian uses for submarines include marine science, salvage, exploration and facility inspection and maintenance. Submarines can also be modified to perform more specialized functions such as search-and-rescue missions or undersea cable repair. Submarines are also used in tourism and undersea archaeology.

French submarine Ouessant (S623) was used to train the first Royal Malaysian Navy crews from 2005 to 2009. It was lastly used by the Royal Malaysian Navy and French Navy in July 2009 when journey through the Atlantic Ocean was made. On 23 September 2011, Malaysian Ambassador to France Tan Sri Abdul Aziz Zainal signed an agreement for the ownership of the unused submarine with French Defense Minister.

The decommissioned submarine was transported by sea by Felda Transport Services Sdn. Bhd. and Jumbo Shipping. It departed from French Naval Base in Brest, France on 9 October 2011. It reached in Malaysia on 13 November 2011 and arrived in Klebang on 17 November 2011. The museum was opened to the public on 22 November 2011 for 10 days as a promotional preview. A total of 25,000 visitors flocked into the museum, including Yang di-Pertua Negeri of Melaka Mohd Khalil Yaakob.

Yes, it was a real Submarine but now it is converted to a museum.

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Thanks to google: https://en.wikipedia.org/wiki/Submarine,
https://en.wikipedia.org/wiki/Submarine_Museum

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