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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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The enigmatic shipwrecks of El Faro and the Empress of Ireland occurred a century apart and both remain a mystery of the sea; armed with the latest underwater tech, experts explore these doomed ships to discover what set them on the path to catastrophe.

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The remains of five warships could reveal new insights into how the nuclear arms race changed the world forever; using 3-D sonar scan technology, an expert team of marine scientists investigate the catastrophic effects of atomic explosions at sea.

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