Just in time for Iran:

Meet Deep Digger, first of a revolutionary new generation of bunker-busting weapons, described in this week’s New Scientist. This is literally ground-breaking new technology which uses cannon to tunnel through solid rock, drilling a channel for the bomb.

Deep Digger is different. It does not depend on the kinetic energy of the warhead at all – in fact, it parachutes down. Then it stars drilling. The weapon is limited only by how deep the drilling process can go, which is a matter of how deep it can ‘muck’ (clear debris from the shaft). And although the details are classified, that is much, much deeper than any kinetic weapon will ever go. In the tests last year, it demonstrated a tunneled down ten meters -- about 50% more than the BLU-113, which is the current record holder.

Deep Digger can carry a range of warheads, as well as sensors and communications. It can stay in touch with the launch aircraft and report its progress; multiple Deep Diggers could be co-ordinated to detonate simultaneously producing a combined shockwave.