Four carefully selected films from the IWM vaults, all made during wartime, vividly depicting life on board the Atlantic convoys and the weaponry and tactics used to protect them. They are: Operational Height (seabourne barrage balloons), Night Attack on a Convoy (Officer's training film), Food Convoy (1940 documentary) and Escort Teams at Work (1943 RN film on convoy protection). The DVD includes a bonus film Merchant Seamen.