The wreckage of a German World War One U-boat remains marooned in a remote area of mudflats off the Kent coast where it has been lying for nearly 100 years.

It is believed it could be UB122, which was among more than 100 U-boats which surrendered at the end of the war and brought to the River Medway to be scrapped.

Mark Dunkley, of English Heritage, said it was thought to be the only visible U-boat wreckage in the UK.

Archive footage courtesy of British Pathe.