Mixed among the countless U-boat wrecks around Britain s coast are examples of the first fifty years of British submarine history. This unique film explores seven rare British submarine wrecks: Holland 5 - the first submarine to be commissioned into the Royal Navy A3 - a fine example of this early class of submarine L24 - lost with all hands in a collision with HMS Resolution M1 - lost with all hands in a collision with a collier whilst on exercise M2 - lost whilst on exercise in a diving accident HMS Tantivy - sunk as a sonar target and then lost HMS Affray- lost in an accident whilst on exercise Shot by renowned diver and historian Innes McCartney, these wrecks represent a snapshot of the rich maritime heritage found around the shores of the British Isles.