TAT-1 (Transatlantic No. 1) was the first submarine transatlantic telephone cable system. It was laid between Kerrera, Oban, Scotland and Clarenville, Newfoundland.[1] Two cables were laid between 1955 and 1956 with one cable for each direction.[1] It was inaugurated on September 25, 1956.[2] The cable was able to carry 35 simultaneous telephone calls.[3] A 36th channel was used to carry up to 22 telegraph lines.[3]