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The underground world is a largely unexplored universe. Find out what goes on in the subterranean world of our planet Earth.
2009
8.1
2011
7.7
2001
7.0
2008
1990
6.0
2006
8.5
4.3
7.5
2021
8.4
2015
8.0
2014
7.8
6.7
2017
2020
2005
2013
10.0