"Todd Fatheree" wrote in
:

When they
did it on TOH, the pro used a pneumatic drill with a special bit that
had a hole in it that compressed air blew into.

Note that this is an excellent way to give yourself a bad case of
permanent lung damage. If you use such a drill, be sure to wear
suitable protective gear.

Serious professional drills pump water down the bore, not compressed
air, an innovation the mining industry adopted after killing off the
first generation of pneumatic drill users.

John