Browse all 8 episodes in this season, including available images, air dates, runtimes, ratings and episode summaries from TMDB.
Episode 1
Lost civilizations, mysterious cities and legendary sites have all vanished. Can draining the seas help unlock what caused their demise?
Episode 2
For centuries treasure ships sailed the world hunted by pirates, battered by storms and reefs. Only now can we begin to explore what remains of them.
Episode 3
Under the seas lives a lost graveyard of sunken war ships. Countless vessels from WWI and WWII pepper the seafloor waiting to be explored.
Episode 4
Towering walls of water, powerful winds and churning seas can overwhelm any ship. But what secrets of the stormy seas can now be revealed?

Episode 5
In warfare, saboteurs are a silent, unseen enemy with advanced weaponry and their element of surprise sending many ships to their final resting place.
Episode 6
War, weather and human error have led to some of the worst maritime disasters history. Drained dry we now reveal the mysteries along America’s shores.
Episode 7
The seafloor is the world’s biggest tsunami machine and its dangers have remained hidden from view, until now!
Episode 8
Beneath the waters of the world, lies undersea empires and relics of their bloody wars. Can today’s technology uncover these lost empires?