Summary: A "careless talk" film, used for military training, pointing out the dangers of telephone conversations, emphasising that speech over the line is never secret.
Description: Several short scenes illustrate how information communicated over the telephone can easily reach the wrong ears. Telephone wires can be tapped, telephone operators can perhaps forget their obligations under the Official Secrets Act, speaking into a phone in a public place may be overheard, a hotel switchboard operator can listen in (hears that the VIP is coming to Hastings on Friday, chats in pub that evening, perhaps providing the Germans with an easy opportunity to kill Churchill in a bomb raid), crossed lines even on priority calls. Telephone users must always make sure who they are speaking to, then use a prearranged code to communicate or acquire secret information. A final harrowing scene shows the high price paid by those who ignore the film's warning: superimposition of floating corpse of soldier over sobbing fiancée after soldier had told his girl over the phone about his overseas posting, this scrap of information giving a U-boat captain an easy victim.
