Have you ever wondered what is the most deepest and darkest place on earth?
1 mile
2 miles
3 miles
4 miles
5 miles
6 miles
7 miles
Challenger Deep is the bottom where human life is impossible according to “The Mariana Trench Mystery | Earth & Universe HD”
More information can be found here:
http://www.deepseachallenge.com/the-expedition/mariana-trench/