Mohole Dig demands floating control system in deep water

Mohole is the National Science Foundation's program to drill through the earth's crust under the ocean and into the unknown mantle below that is known as the Mohorovic Discontinuity. The drilling may take three years. By a system of controls, the drilling platform (mounted on stilts above pontoons that look a little like submarines) must be held almost directly above the hole to be drilled.