This episode looks at 3 different German U-Boat wrecks, including UC-66 - the first to be sunk by a plane and U480 - the world’s first stealth sub.

Armed with the latest undersea technology and personal testimony, we board two doomed ships to discover what set them on the path to catastrophe.

Survivors' stories and world-leading shipwreck investigators uncover how even the most powerful warships had their weaknesses and paid a fatal price.

We uncover the remains of warships from the remote Pacific to the Atlantic, revealing new insights into how the atom bomb changed our world forever.

How the Americans launched a massive bombardment of the Japanese fleet– and how the German liner Wilhelm Gustloff was torpedoed by a Russian sub.

Two of the greatest failed invasions in the history of naval warfare. How the Spanish Armada was defeated and why the Allied fleet was crushed in WW1

Investigations reveal the greatest scuttle and act of defiance in wartime history. Testimonies and CGI illuminate the events and subsequent salvage.

Investigations into three historical collisions expose the volatile risks at sea and how they have shaped regulations and technological advancements.

We discover two ships laden with deadly cargos. The sunken beasts are ticking time bombs and no one knows exactly when or how they might explode.

During WW1 two warships sank in controversial circumstances north of Scotland. We can now bring these two deeply mysterious wreck stories to life.