Backstory: H.G Wells’ Morlocks as inspiration
Morlocks are a fictional species created by H. G. Wells for his 1895 novel, The Time Machine. They dwell underground in the English countryside of A.D. 802,701 in a troglodyte civilization, maintaining ancient machines that they may or may not remember how to build. Their only access to the surface world is through a series of well structures that dot the countryside of future England.
Morlocks are humanoid creatures, said to have descended from humans, but by the 8,028th century have evolved into a completely different species, said to be better suited to their subterranean habitat. They are described as “ant-like”, because they possess the ability to crawl up walls. Via Wikipedia
Related Backstory: Murlocks the Fish-Men