The Mantle
The dense shell then leads to the mantle, an inexplicable inner layer. Nearly 40% of the Earth’s mass is contained within this deeper layer. As far as scientists and researchers are worried, this led to an amazing ride.
Project Mohole
With the launch of Project Mohole in 1958, the United States got the lead. It is close to the Mexican city of Guadalupe. A team of engineers worked on the project, which involved drilling through the Pacific Ocean bed.