How deep is the deepest man made tunnel?
How deep is the deepest man made tunnel? According to some, this is the entrance to hell. This is the Kola Superdeep Borehole, the deepest manmade hole on Earth and deepest artificial point on Earth. The 40,230ft-deep (12.2km) construction is so deep that locals swear you can hear the screams of souls tortured in hell.
Has anyone been to the bottom of the Mariana Trench?
Nobody has walked on the bottom of the Mariana trench, but six people have descended to it in submersibles.
What is the deepest tunnel for cars?
It is part of the Norwegian National Road 13 running between Stavanger and Ryfylke (district) under the Horgefjord (part of the Boknafjord). The tunnel is part of the Ryfast project. It is 14.4 kilometres (8.9 mi) long and is currently the world's longest subsea road tunnel, and the deepest tunnel of any kind.