Herrenbergberg Cave in Germany
By Water Resources Mission Area
2009 (approx.)
Detailed Description
The Herrenbergberg Cave in Germany was discovered during the process of digging a new high speed train tunnel. Before its discovery, it was isolated from the surface.
For more information see: https://water.usgs.gov/nrp/microbiology/research/pristine/pristine.html
Sources/Usage
Public Domain.