While the U 19 submarines had plenty of success, they weren't the only type Germany sailed during the conflict. Germany built 329 U-boats of different types, which Imperial Germany and its allies ...

Solved: Mystery of missing WW1 German submarines uncovered after explorers find remains of 41 U-boats off UK coast. Vessels discovered near south and east coasts ...

The submarines shown were surrendered by Germany at the end of the war and sank off the coast of Cornwall. The images from 1921 have been donated to Historic England. More on the stranded ...

The vessels themselves were much more cramped than submarines today — the F-1 was only 143-feet long. The crew of the USS F-1 during its service. U.S. Navy photo.

In 1917 Britain and her allies were losing hundreds of ships every month to German U-boats. These deadly submarines patrolled the waters of the United Kingdom watching for ships to destroy. Their ...

The majority of WWI submarines no longer exist, as many were sunk or sold for scrap. This isn't an unusual practice for the world's navies, but some boats remain and can be visited in museums.