Disasters in Medway - The HMS Princess Irene Explosion
Google maps (220.127.116.11 N, 00.41.37.44 E)
27 May 1915, 377 dead.
Most of the bodies of the men who were killed in the explosion are still at the bottom of the Medway Estuary. Of those that were washed ashore, ten are buried in a communal grave with unidentified men who died on HMS Bulwark. There is more information on the HMS Bulwark page.