A group of divers have explored the wreckage of a WW1-era Royal Navy submarine – 100 years after it sank. Dominic Robinson, 54, and a team of 10 dived 74m down to check out the century-old HMS M1 sub ...

Introduction -- State of play -- Beat to quarters -- Aloft -- "Drab efficiency" : the making of the convoy system -- Sending the hunters -- Battleship boys -- Keeping the seas -- Chasers -- Barrages, ...