The Beast in the Cave

"The Beast in the Cave" is a short story by American horror fiction writer H. P. Lovecraft. The first draft was written in the Spring of 1904, with the final draft finished in April 1905, when Lovecraft was fourteen. It was first published in the June 1918 issue of the amateur press journal The Vagrant.
A man touring the Mammoth Cave becomes separated from his guide and becomes lost. His torch expires and he is giving up hope of finding a way out in the pitch dark, when he hears strange non-human footsteps approaching him.