As shipwrecks of World War II continue to erode in the sea, their toxic cargoes continue to pose a catastrophic threat; now, experts use cutting-edge tech to investigate and reveal the potential impact of these noxious underwater dangers.

For over a century, the stories and wrecks of HMS Hampshire and HMS Vanguard continue to be shrouded in mystery; now, two research teams are granted special access to investigate and uncover what happened to these WWI warships in their final moments.

Three historical collisions expose the volatile risks at sea and how they have shaped the technological advancements of today; now, maritime researchers explore the remnants of these shipwrecks to uncover what happened in their fatal, final moments.

Countless shipwrecks lost in the depths of the oceans are time capsules containing tales of adventure and tragedy; now, marine experts hunt to locate these forgotten ships, explore their secrets and unlock their incredible stories.

More than 50 massive warships were lost in a matter of hours in the Scottish natural harbor of Scapa Flow during WWI; now, marine archaeologists use cutting-edge tech to explore one of the greatest acts of defiance in wartime history.

The aerial bombardment of the Japanese fleet and the torpedo strike of the Wilhelm Gustloff are two of the most shocking attacks of WWII; now, expert divers explore these underwater graveyards for new evidence of these maritime conflicts.

The USS Arizona and the HMS Hood were two of the most powerful warships in history, but their weaknesses paid a fatal price; experts investigate evidence that may reveal why the age of the battleship has come to a sudden and violent end.

The wreckages of three German U-boats are eroding at the bottom of the sea along with the stories behind their disastrous fate; now, a team of maritime archaeologists race to locate the submarines and solve the mystery behind their deadly demise.