 From 15 January 1946 to 27 April 1949, "Diablo" was based in the Panama Canal Zone participating in fleet exercises and rendering services to surface units in the Caribbean Sea.From 23 August to 2 October 1947, she joined the submarines and for a simulated war patrol down the west coast of South America and around Tierra del Fuego.The three submarines called at Valparaíso, Chile, in September while homeward bound.