0
To an extent it was not.
15 years
Project Mohole took place in the deep ocean offshore of Guadalupe Island, about 200 miles off the coast of Baja California, Mexico. The aim of the project was to drill through the Earth's crust to reach the mantle beneath the oceanic crust.
The ISBN of The Mohole Mystery is 0571082106.
The Mohole Mystery was created in 1968.