Massive US Submarines Breaking Through Ocean of Ice in the Arctic

US Navy Submarine USS Hartford emerging from ice during the ICEX 2016.  Link to article.
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World War 2 History: The Only Time in History a Submerged Submarine Sank Another Submerged Submarine

In movies and books about the Cold War and whatever era we are in now and wherever we're going, it is not uncommon for two submarines to fight each other deep below the ocean's surface. Usually, one emerges victorious, while the other, holed or blown to pieces, disappears into the freezing, inky depths below. In actuality, there is only one documented instance in history of a submerged sub attacking and destroying another submerged sub.  Link
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HMS Triumph: Life on board a Royal Navy submarine

HMS Triumph is one of the Royal Navy's Trafalgar class submarines, using its stealth on counter-piracy, anti-terrorism and narcotics operations. BBC defence correspondent Jonathan Beale has had exclusive access to the confined space where 120 crew members serve.  Article on BBC web site:  Link
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Remembering the M2 submarine disaster 80 years on

The submarine sits silently on the seabed. Inside, the bodies of 58 sailors still rest, 80 years after the vessel sank in the English Channel off Dorset. Now some of their family members hope to sail out to the wreck to mark the anniversary of the tragedy. HMS M2 was the world's first underwater aircraft carrier, but it went down with the loss of all 60 hands - including two airmen - in 1932. See the BBC web site for more on this story. Link
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