These are not intended to be mutually exclusive, but may be combined as required.

1. Drop on MOP after another into the same hole until the desired depth has been reached.

2. Fix a rocket motor to the MOP to permit it to strike the surface at several times the current impact velocity.

3. Place a four tonne tungsten carbide penetrator on a large ICBM which will penetrate at least 500 meters of material regardless of its composition.

4. Use molten iron to melt through rock.
4.1 Drill a starter hole with one or more MOPs.
4.2 Then hit the hole with sufficient ordinary bombs to form a huge crater.
4.3 Fill the crater with circa a thousand tonnes of thermite carried in thin-walled containers.
4.4 Ignite thermite in the crater to produce a lake of molten iron that follows the existing hole and can melt its way through a thousand meters of solid rock.