You have it John Walker. Truculent went down and all but 10 escaped with the majority of those escaping dying of hypothermia on the many mud banks in the Thames Estuary.
Whilst being employed by the Admiralty the vast majority of the salvage operation; ships, tugs, divers, etc are all civilians. I joined this organisation in 1966 and spent 40 years with them.
The picture shows some of the survivors coming ashore at the Bull Nose, Chatham Dockyard.
This operation was recorded by Pathe News and the scene depicted in the photo can be seen at 1m 15s.
Over to you.