Have found the reference for you of the reprint of the Bob Davies paper, originally published in "Nature":
Davies R E, 1999 (reprint date), Water at a depth of -5 ft discovered by diving in Peak Cavern. Cave Diving Group Newsletter 130 (January 1999) pages 4 - 6.
The original paper (bearing the same title) appeared in Nature Vol.166 p.894 (1950) and the copyright is owned by Macmillan Magazines Ltd.
The paper makes no reference to any rescues - but it does tell us that the divers involved with Davies were F. G. Balcombe, D. A. Coase, W. H. Davis, C. W. Mack and J.A.Thompson. As a record of their efforts to perform a detailed scientific experiment in an underwater cave, shortly after the war, this paper is fascinating.