The Darkness Beckons (ISBN 0-939748-32-0) is the definitive book on the history of UK cave diving.

It was written by Martyn Farr, a major figure in UK diving at a time when many of the original participants were still alive and available for interview.

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beckon

verb:   signal with the hands or nod
verb:   summon with a wave, nod, or some other gesture
verb:   appear inviting (Example: "The shop window decorations beckoned")