Uboat.net is the brainchild of Gudmunder Helgason, an Icelandic U-boat enthusiast who spent years researching German submarines for a historically accurate novel. Though the novel was never written, Helgason's copious research fills the 7,000 pages of his Web site with definitive information on every U-boat commissioned.

The Canonesa and the Convoy HX72 were two British ships that the German U-100 attacked in a massive September 1940 battle. This award-winning site describes the events of the attack, which claimed the lives of 116 men, and the escapades of U-100, which took down seven ships in just over three hours.

U-505, a German submarine captured in battle by the U.S. in 1944, has been a popular exhibit at Chicago's Museum of Science since 1954. CMSI's new Web site makes the U-505 experience possible in cyberspace with a QTVR tour of the boat's interior and RealAudio recordings of former U-505 seamen describing life on board.

This online archive contains a portion of the World War II U-boat photograph collection housed at the National Archives. The collection serves as a fascinating visual history of the so-called "U-boat war" from the perspective of the U.S. and its allies.

John Phillip Holland was the architect of the first submarine that could travel underwater for long distances, the USS Holland, which the U.S. Navy commissioned in 1895. Holland also invented a respirator that enabled a person trapped in a damaged submarine to escape. To learn more about his life and his submarines, visit this extensive site.

In 1993, Dutch and Danish salvagers brought U-534 to the surface, and today she is on display at the Historic Warships Museum at Birkenhead Docks in Liverpool, England. This Web site offers background information, photos, an interview with a U-534 survivor, a U-534 forum, and more.

Here you will find a history of U-995, a Type VIIC/41 U-boat that saw action in the arctic during World War II and today rests on a beach near Kiel, Germany. Note: This site is in German.

This Web site offers a QuickTime VR tour of U-2540, an advanced Type XII U-boat that is a floating museum at the Deutsche Schiffahrtsmuseum in Bremerhaven, Germany. Note: This site is in German.

For this new, in-depth look at German submariners during World War II, Mulligan, an archivist and author of Lone Wolf: The Life and Death and U-Boat Ace Werner Henke, surveyed more than 1,000 U-boat officers and enlisted men. The result challenges conventional views of Nazi Germany's submarine service.

If you want even more details on submarine history than we offer in 400 Years of Subs, you will find them here. Chapters range from "1580-1696—Of Innkeepers, Alchemists, and Mathematicians," to "Unto the Present Time," which focuses on the latest-generation U.S. Navy submarine, Seawolf.

A highly detailed, large-format technical history of German U-boats. Profusely illustrated with cross sections, historic photos, tables, charts, and maps.

Heavily illustrated with black-and-white photos, this book, in the words of its author, "dramatizes the history of the U-boats, their designers, officers, and crew with stories of life at sea and ashore, of their exploits on patrol and under attack, of successful raids and sunken missions, many of which will be unknown to most readers of military history."