After years of work deep under the surface of the earth, drilling on the Gotthard Base Tunnel is set to be completed on Friday. It will be years before the first trains roll through the 57-kilometer-long tunnel, but given the difficulties workers have encountered, it is a wonder they have come this far.
They are both celebrated as wonders of mankind's ingenuity and engineering expertise: the Panama Canal and the Suez Canal, deep pathways slicing through the surface of the earth for the benefit of global trade.
On Friday, a third such wonder will take a decisive step toward completion. Only 1.8 meters (just under six feet) of rock stand in the way of the Gotthard Base Tunnel from becoming the longest tunnel in the world. On Friday afternoon, the gigantic drilling machine Sissi is scheduled to break through that final barrier far below the peaks of the Alps. Accompanied by a subterranean celebration and live coverage from the world's media, the breakthrough is a significant milepost on the road to completion for Europe's largest infrastructure project.