Three historical collisions expose the volatile risks at sea and how they have shaped today's technological advancements. The RMS Queen Mary sliced through her WWII escorting light cruiser HMS Curacoa which sank in 1942 off Ireland's northern coast. An unidentified ocean-going schooner struck the passenger liner SS Oregon sinking off the New York coast in 1886. The SS City of Chester sank after the RMS Oceanic rammed her in 1888 in San Francisco Bay near the Golden Gate. Now, maritime researchers explore the remnants of these shipwrecks to uncover what happened in their fatal, final moments.

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. Examined are: Operation Davy Jones' Locker: the Allied post-war sea disposal of captured German chemical weapons; the SS Richard Montgomery, a Liberty ship sunk in the Thames Estuary, near Sheerness, England with 1,500 tons of explosives; and the Norwegian SS Skytteren scuttled off Måseskär, Sweden with 170 tons of oil on board.