"Salvaging Aircraft during the War - A Diver's Log Book" by Caradog Ellis, Llanfairfechan

The writer was employed during the war of 1939-45 as a diver in small salvage craft used in laying buoys, targets and salvaging various types of aircraft, and gives a most interesting account of his experiences

Another catalogue description can be found here https://archiveshub.jisc.ac.uk/data/gb222-bmsscar