rock borer

rock borer

n
(Animals) any of various sea creatures that bore into rock, such as some sea urchins, sponges, annelid worms, barnacles, isopods, and molluscs
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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It took eight years to complete and cost pounds 8million, and the programme reveals how more than one million tons of rock, gravel and clay were excavated and in an age before high speed rock borers this was a tunnel that was `navvied' out by 1, 700 men with pickaxes and explosives.
The Insider: Tunnel vision

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