Fat old english bloke
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Do you mean David Poyer?
Down to a Sunless Sea: A Tiller Galloway Underwater Thriller by Poyer, David: Good (1998) | SecondSale
Free Shipping - ISBN: 9780312964078 - Soft cover - St. Martin's Paperbacks - 1998 - Condition: Good - Item in good condition. Textbooks may not include supplemental items i.e. CDs, access codes etc. - Down to a Sunless Sea: A Tiller Galloway Underwater Thrillerwww.abebooks.com
It's a good read and references places that most cave divers that have dove in North Florida would be familiar with (white room). A couple of cave divers were technical advisors for it.
Definitely not - the Boon book was published over a decade before.
I’ll look out for a copy of the Poyer novel though, it sounds like it might be enjoyable to read.