Reaching The Mantle
They were able to descend to a depth of over 600 feet before being rescued. Even yet, Project Mohole was ultimately abandoned eight years after its financing had been withdrawn. The Americans were unsuccessful in their search for the mantle.
The Soviets
After that, it was up to the Soviets to put their money where their mouth was. In the Pechengsky District, a group of researchers began drilling into the crust below the surface of the Earth’s crust. Comparatively speaking, it was a different method than what had been taken by the initial researchers.