Reaching The Mantle
They were able to descend to a depth of over 600 feet before being rescued. Even so, Project Mohole was ultimately abandoned eight years after its funding had been withdrawn. The Americans were unsuccessful in their search for the mantle.
The Soviets
Following that, it was up to the Soviets to decide whether or not to give it a shot. Drilling into the crust beneath the Pechengsky District was started by a group of specialists. Compared to the original researchers, this was a different strategy to implement.