Returning to the site where he arrived, the Time Traveller is shocked to find his time machine missing, and eventually concludes that it has been dragged by some unknown party into a nearby structure with heavy doors, locked from the inside, which resembles a Sphinx. Luckily, he had removed the machine's levers before leaving it. Later in the dark, he is approached menacingly by the Morlocks, ape-like troglodytes who live in darkness underground and surface only at night. Within their dwellings he discovers the machinery and industry that makes the above-ground paradise possible. He alters his theory, speculating that the human race has evolved into two species: the leisured classes have become the ineffectual Eloi, and the downtrodden working classes have become the brutal light-fearing Morlocks. Deducing that the Morlocks have taken his time machine, he explores the Morlock tunnels, learning that due to a lack of any other means of sustenance, they feed on the Eloi. His revised