The caves held many secrets and a good living for any man willing to be adapted - to become a water-breather. Even if this meant they could never leave the planet, a select few found it worthwhile. Griffith was one. He was a loner who went his own way and didn't get involved with the politics of his planet, or with women, or with anything or anyone in particular. That was the way he wanted it. Until the day he came across a particularly good matrix containing thelemite and found the Colonial Authority and even the Divers' Guild after his hide.
Used availability for Lee Hoffman's The Caves of Karst
August 1970 : UK Hardback
January 1969 : USA Mass Market Paperback