Cyril Donson – Draco The Dragon Man (NEL, Oct. 1974)
Blurb:
Damon Draycot had won world renown as a historian and archeologist. He made many television appearances and his athletic exploits were no less eagerly followed. He was well-known and respected on all sides.
His latest nine-month expedition was potholing in Texas. There were many miles of underground passages to explore for mineralogical, medical and historical facts — and simply to conquer. This proposed feat captures the public imagination, and many are there to wish Draycot luck.
What happens to him underground would not be wished on any other man. Thereafter his life was never to be the same; dogged by an unfathomable curse that led him to shun his fellow creatures, this innocent expedition brought a nightmare of horror and evil into the light of day.
See also Draco the Dragonman thread on the Vault forum