As Daniel will be at sea by now, I will answer your question on his behalf;
The wreck is that of the "Richard Montgomery" which is approx 1.5-2kts from Garrison point at Sheerness, situated at the mouth of the Thames and Medway Esturies.
She went down during the war and was carrying quite a few thousand tonnes of explosives/bombs etc. These are still in situ as it is deemed by the Royal Navy too dangerous to move them. It is inspected annually for safety and a report is made to the Ministry of Defence and various other agencies.
David B may be able to tell us more as he is nearer to it than I am
and being a lifeboatman would be able to recount some horror stories I should imagine.
Daniel: I am shore based in the Medway area today, some one else (lucky s*d) is going back with the boat
Hope you have had a good day by the time you get back.