I've managed to track down this Fury from the Deep forerunner:
The Slide is a sci-fi radio serial in seven parts by Victor Pemberton. It begins with an earthquake in Southern England. Then the local wildlife starts to disappear. It starred Roger Delgado, Maurice Denham David Spenser and Miriam Margolyes. The producer was John Tydeman and sound effects were by the BBC Radiophonic Workshop.
BBC database Genome lists the program as first transmitted on the BBC Light Programme on 13 February 1966 at 19:00 with the next six episodes following weekly. The programme was not repeated up to the Genome cut-off date of 2009.
This was Victor Pemberton's first science fiction story which he submitted for the BBC TV series Doctor Who in 1964. It was rejected by script-editor David Whitaker, but following a revision it was accepted as a radio serial, commissioned by future Doctor Who producer Peter Bryant.
It inspired the Doctor Who story Fury from the Deep.
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