tunnelling

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(n) a passageway through or under something, usually underground (especially one for trains or cars)
(n) a hole made by an animal, usually for shelter
(v) move through by or as by digging
(v) force a way through

You have a Higgs field tunnelling in a quantum fluctuation through the energy barrier in a false-vacuum state, and you get this bubble of broken symmetry that by negative pressure .

"This measurement is a very important step towards the goal of really understanding how tunnelling happens," Krausz told New Scientist. "Physicists are trying to understand what's going on in the microscopic world, and even without immediate...
on Apr 4, 2007 By: Ferenc Krausz Source: New Scientist (subscription)
Speaking about the prospects for the airport rail link Swinney said: "In my personal opinion, EARL is pretty dead. There are practical problems such as tunnelling under a live runway, getting the type of trains that do not exist yet to run on the...
on Jun 28, 2007 By: John Swinney Source: Transport Briefing