The World's Deepest Worm

‘Worms from hell’ unearth possibilities for extraterrestrial life

...For the first time, scientists have found complex, multi-celled creatures living a mile and more below the planet’s surface, raising new possibilities about the spread of life on Earth and potential subsurface life on other planets and moons.

Nicknamed “worms from hell,” the nematodes, or roundworms, were found in several gold mines in South Africa, where researchers have also made breakthrough discoveries about deep subterranean single-cell life...

This is pretty cool; it represents a pretty significant extension of the biosphere, if the penetration of these worms is a world wide phenomena.  

...Borgonie speculates that the nematodes, which feed on bacteria, traveled through the cracks and crevices of rock in search of food. While they were determined to have lived deep underground for 3,000 to 10,000 years, the bacteria discovered by Onstott was found to have lived at its great depth between 3 million and 40 million years. A major difference between the two appears to be that while the nematodes adapted, the bacteria have evolved.

Complete worms, up to one-third of an inch in length, were found in two mines, and DNA of another was found in a third. They were found in water flowing from boreholes in the rock of the mines at depths from two-thirds of a mile to more than two miles. The worms nearer the surface were brought to a lab and survived, while the specimen at the deepest level was a DNA sample from a nematode but otherwise impossible to identify.

The distinction between "adapted" and "evolved" above is bullshit.  The nematodes have almost certainly evolved during their 3,000-10,000 years underground, even if they started as "pre-adapted" for their underground existence.

So what eats the worms...?