02/06/2016 5:26 AM AEST | Updated 02/06/2016 5:41 AM AEST

The World's Longest Rail Tunnel Has Just Opened In The Weirdest Way

This will haunt your dreams, but you will also kind of love it.

After 17 years of construction and 28.2 million tons of excavated material, the world’s longest and deepest rail tunnel has opened in Switzerland. And the ceremony featuring alphorn players, topless "angels" and goats, could not have been more bizarre.

Masked acrobats and interpretive dancers dressed like miners ushered in the Gotthard Base Tunnel’s opening near the town of Erstfeld Wednesday.

Leaders from six countries attended the flashy ceremony, including German chancellor Angela Merkel and French President François Hollande.

At the opening ceremony, Swiss Federal President Johann Schneider-Ammann called the tunnel a "giant step for Switzerland but equally for our neighbors and the rest of the continent," the BBC reports.

Planning for the $12 billion tunnel began in 1947. Switzerland is touting it as a modern marvel, with its 35 miles of high-speed rail connecting northern and southern Europe beneath the Swiss Alps.

Its astounding length beats the previous record holder, Japan’s Seikan rail tunnel, by two miles.

Arnd Wiegmann / Reuters
The train will cut passengers’ travel time between Zurich and Lugano, just north of the Italian border, by about 45 minutes.

At roughly 124 mph, or 99 mph for freight train, it will cut passengers’ travel time between Zurich and Lugano, just north of the Italian border, by about 45 minutes.

Eventually, the tunnel will run 260 freight trains and 65 passenger trains per day, according to the tunnel's website.

“It is just part of the Swiss identity,” federal transport office director Peter Fueglistaler told Reuters of the Swiss fondness for major engineering feats. “For us, conquering the Alps is like the Dutch exploring the oceans.”

Arnd Wiegmann / Reuters
About 28.2 million tons of material were removed during the tunnel's 17 years of construction. The northern gates near the town of Erstfeld are seen.

Among its most impressive tools used to complete the dig was a monster-sized tunnel boring machine measuring 448-yards in length, or a little less than four football fields placed end-to-end.

"A large proportion of the excavated rock was returned to the mountain's interior in the form of concrete,” according to the tunnel’s website. “The remaining material was used for landscaping of the site or as fill for fans."

Among its deepest points was roughly 1.2 miles beneath the Earth's surface.

A shirtless performer wearing large wings is seen during Wednesday's opening ceremony for the NEAT Gotthard Base Tunnel.

Also joining European leaders at the grand opening Wednesday were 500 passengers, who won a lottery to attend, The New York Times reports.

Among the performances was a topless dancer wearing giant wings who soared over orange-suited dancers as they crawled on the ground below.

At another point, humans dressed like bales of hay were seen swaying on a flatbed before running around on the floor.

The performance included everything from this eagleman to what appeared to be dancing bales of hay.

Some of the scarier parts of the performance reportedly captured the area’s “mountain demons” -- which can be the storms, unidentified shapes and sounds, and falling objects, according to the tunnel’s website.

The whole spectacle left many people on Twitter both amused and confused.