These underground structures were formed 65 and 800 years ago and are almost completely dark and may also contain toxic minerals and gases.
The samples were taken between 2006 and 2009, and again between 2017 and 2019, thus finding even more unique life forms than expected.
When researchers sequenced 70 samples, they were unable to compare the results with known births and species, at least with a high degree of reliability.
This suggests that caves have poorly studied and diverse ecosystems, written by the authors of the study.
In recent years, underground germs have become increasingly interesting because they exist in conditions very similar to those found on Mars.
It is possible that found microbes can produce carbon using light energy.