On 9th June 2011 it was 80 years since HMS Poseidon sank off the coast of China after a collision with a merchant steamer. HMS Poseidon was a Royal Navy Parthian Class submarine and she sank north of Weihai in Shandong province. Roughly 3 hours after the sinking, 6 of the 26 crew managed to escape from the sunken submarine and made it to the surface.
Steven Schwankert has been researching the history of this submarine for 5 years. I first got an inkling about it after he gave a talk to South China Diving Club in Hong Kong about diving Lake Khosvgol in Mongolia. Since then he has pieced together the story of what happened to the submarine before and after it sank.
There is now a trailer for a documentary about the Poseidon Project available on YouTube which I have taken the liberty of embedding here:
Ex-Portsmouth people should keep an eye out for the submarine escape training tower and Portsmouth Harbour station.