SOS is the ultimate cry for help of a crew in distress - Royal ships, supposedly unsinkable vessels, abandoned crews, ecological disasters, unexplained disappearances, abysses and remains require additional decoding - Using the latest technologies, and with the assistance of the finest archaeologists, historians and naval engineers, this documentary series retraces, minute by minute, the exact circumstances of these disasters. The chain of events leading to the wreck is decoded at a breathtaking pace. Time is relentless and suspense awaits at every turn.