Beneath our feet is an incredible world full of life we can’t see. This hidden ecosystem, often called the “subterranean Galapagos,” is packed with billions of microorganisms. Recent research reveals that about 70% of all microbes on Earth live underground, making it a treasure trove of life waiting to be explored.
In 2018, researchers presented fascinating findings at the American Geophysical Union’s annual meeting. They discovered that these tiny life forms weigh around 15 to 23 billion tonnes of carbon. To put that into perspective, it’s hundreds of times more than all humans combined.
While scientists have only started to understand these microbes, initial studies suggest their genetic diversity might rival that of life above ground. There are no giant tortoises down there, but bacteria, archaea, and some eukarya thrive in this unseen world. For instance, an unidentified nematode was found over 1.4 kilometers below the surface in a South African gold mine.
Karen Lloyd, a microbiologist from the University of Tennessee, shared her excitement about these findings. She noted that just a decade ago, research was limited to a few spots where life was expected. “Thanks to ultra-deep sampling, we now know we can find life nearly everywhere, even in extreme conditions,” she pointed out.
The research involved studies that gathered samples from depths of 2.5 to 5 kilometers. Surprisingly, the volume of this deep biosphere is almost double that of all the oceans combined.
Despite the extreme heat, pressure, and lack of light, this underground world could provide answers to big questions about life. Rick Colwell, a microbial ecologist at Oregon State University, emphasizes that much remains to be learned. We still don’t fully understand how life beneath impacts life above.
As we explore this fascinating underground realm, it’s clear that there’s so much more to discover. Understanding these hidden organisms could change how we think about life on Earth and even other planets.
For more information on deep biosphere research, you can check resources from the American Geophysical Union.
