Dr. Bob Ballard dives to the ocean depths searching for British and French warships that sank during the Battle at Gallipoli - one of the bloodiest and most controversial campaigns of World War I.
In a conflict packed with devastating battles, Gallipoli stands out as one of the First World War's most futile and bloody battles. But the story of this blood-soaked part of Turkey lies not only in the soil of the battlefield but also the waters around it.
Now, nearly a century after the fighting stopped, underwater explorer Dr Robert Ballard - the man who discovered the Titanic's final resting place - is starting to piece together long-lost stories of the Gallipoli campaign through the wrecks lying on the sea floor.
We'll scour the warship graveyard using Nautilus, an advanced mobile research vessel with state-of-the-art electronics, computers, navigational and communications systems. It's the most comprehensive underwater exploration of shipwrecks from the Battle at Gallipoli ever taken. Now, stunning HD images from the sea floor could offer tantalizing new details about the Allied army's catastrophic loss and the tragic carnage left in the battle's wake.
Gallipoli's Deep Secrets heads underwater and unearths the wrecks where the firepower of the mighty British Navy was outwitted by a weakened Ottoman Empire, to seal the fate of thousands of young lives. But among the tragedy, Ballard also discovers the unique tale of a lone Australian submarine that achieved what no submarine had ever done before.

Written and Directed by Julia Redwood ; A Prospero Production for National Geographic Channel