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An army experiment in submarine communications falls foul of the deadly secret hidden deep within the cave system housing their transmitter.
23 October 1943, Carlisle, Pennsylvania, USA
1 July 1957, Fayetteville, Arkansas, USA
30 July 1927, Upminster, Essex, England, UK
1 June 1944, Salford, Manchester, England, UK
December 11, 1931 in Handsworth, Birmingham, England, UK
18 May 1923, Jacksonville, Illinois, USA
24 January 1953, Maywood, California, USA
7 February 1950, New York, USA
16 June 1956, Jonesboro, Arkansas, USA
30 August 1951, Santa Barbara, California, USA
7 June 1951, Chicago, Illinois, USA
