What's the largest homebuilt sub in the world?  That nicely styled and full-featured Kraka, based in Copenhagen?  Well yes, she's the largest operational homebuilt that I know of.  But her builder Peter Madsen has been working on his next project...

Read more for the photo.

After going missing over 60 years ago, the US submarine Wahoo (SS-238) has been found between Hokkaido (Japan) and Sakhlin (Russia) islands.  She's laying at a bit over 200 ft.

Commisioned in 1942, this Gato-class fleet submarine completed six highly successful patrols, the last four, plus the fatal seventh patrol, under the command of Cmdr. Dudley "Mush" Morton.  She was one of the most highly decorated US submarines of WWII, with her and her crew earning six battle stars and a Presidential Unit Citation. 

Here are a couple of articles describing a bit more:

Missing WW-II submarine located - United Press Intl

Navy confirms discovery of sub Wahoo - Honolulu Adv.

USS Wahoo - Navsource Online

And a good telling of her story at:
USS Wahoo - Wikipedia.org

Here's a short article that raises an alarm because of the increasing number of submarines under construction around the world.  A mention of how non-nuclear sub effectiveness may be increasing with air independent propulsion and newer weapons.

  American Thinker article...

Dutch Submarines describes a very interesting BBC project - building a replica of the first known submarine.  Is the BBC documenting the history of a Dutch submarine?  Well the inventor was Cornelius Drebbel (Dutch) and he built and demonstrated it for King James I (British) on the Thames back in the 1620s.  

Anyway, the boat is effectively a wood underwater rowboat and the page linked below has some great photos and illustrations of the design and operation of the replica.  Good stuff!

  http://www.dutchsubmarines.com/specials/special_first_submarine.htm

Although the book Hostile Waters, published in 1997, is based on the true story of K-219, this article is a more accurate technical representation of what took place – it leaves out the “Hollywood” aspects and describes the heroic efforts of a crew attempting to save a submarine....

Captain Britanov states that in the eyes of his government, there were no heroes on K-219. When asked the number of times he is called to be a guest lecturer at Russian functions, he simply states, “None – I do not tell the story the way my government wants me to tell it. I did not collide with an American sub.”