c´est un signal de détresse envoyé par un cargo torpillé avec ses coordonnées.
SSS remplace SOS en cas de torpillage.
During World War II a new distress signal, SSS, was devised for use only when the cause of the distress was a submarine torpedoing." From the "Morris Dictionary of Word and Phrase Origins" by William and Mary Morris (HarperCollins Publishers, New York, N.Y., 1977, 1988)
Bonne chasse