The British S-Class submarine that sank twice. Her first was in Portland Harbour on the 16th June 1955 after an explosion in her torpedo bay, while moored alongside other submarines. Valient attempts by members of her own crew and from other boats, were made to evacuate the injured and those trapped in her smoke filled interior were only partially successful, for she flooded and sank with twenty minutes. She took with her thirteen men.

This is her story and your chance to be part of her future history.