The Dark Abyss(1989)
(The second book in the Philip Jose Farmer's The Dungeon series)
A novel by Bruce Coville
Neville Folliot, a 19th century explorer, goes missing and his brother Clive sets out to find him. He stumbles across "The Dungeon", a place of strange atmospheric conditions, beings from distant galaxies and hidden pockets of time.
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Used availability for Bruce Coville's The Dark Abyss
May 2017 : USA Paperback
May 1990 : USA Paperback
January 1989 : USA Mass Market Paperback
June 2016 : USA, Canada, UK Kindle edition