The Scapa Flow is one of Great Britain's most historic stretches of water. Located within the Orkney Islands, Scotland, this sheltered open lagoon has been used by ships since prehistory and for years was the main anchorage of the British Royal Navy. It also played an important role in both World Wars. We travel back to June 21, 1919, which begins with calm seas and clear skies. Yet by day's end, over 50 ships, including some of the most powerful battleships in the world, will sink in what amounts to thegreatest loss of shipping ever in one day. Join the Deep Sea Detectives team as it dives to the bottom of one of the strangest stories in Maritime History!!!