The Mantle
The dense shell then gives way to the mantle, an unexplained inner layer. Nearly 40% of the Earth’s mass is contained within this deeper layer. As far as scientists and researchers are concerned, this led to an interesting journey.
![The Mantle](https://diff3alvfj56r.cloudfront.net/wp-content/uploads/2021/02/02172620/The-Mantle.jpeg)
The Mantle
Project Mohole
With the launch of Project Mohole in 1958, the United States took 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.
![Project Mohole](https://d3drajoq5gm85y.cloudfront.net/wp-content/uploads/2021/02/10061659/Project-Mohole.jpg)
Project Mohole