Generations of Yale undergraduates have defied authority by seeking adventure exploring the subterranean world of steam tunnels connecting buildings in the main portion of the campus. Who knew that Parisians pursued essentialy the same hobby?

London Times:

By day, Lazar Kunstmann is a typically avant-garde Parisian, an urbane, well-spoken video film editor who hangs out in the fashionable Latin Quarter. By night he inhabits a strange and secret world with its base in the tunnels beneath the French capital – the world of the urban explorers.

Mr Kunstmann belongs to les UX, a clandestine network that is on a mission to discover and exploit the city’s neglected underworld. The urban explorers put on film shows in underground galleries, restore medieval crypts and break into monuments after dark to organise plays and readings. In the eyes of their supporters, they are the white knights of modern culture, renovating forgotten buildings and staging artistic events beyond the reach of a stifling civil service.

The authorities view them differently: as the dark side of the City of Light – irresponsible, paranoid subversives whose actions could serve as a model for terrorists. A police unit has been trained to track les UX through the sewers, catacombs and old quarries that are their pathways under Paris. Prosecutors have been instructed to file charges whenever feasible.

The stand-off is symbolic of French society: a rigorous bureaucracy on the surface with a bizarre subculture below. …

Mr Kunstmann said that les UX had 150 or so members divided into about ten branches.One group, which is all-female, specialises in “infiltration” – getting into museums after hours, finding a way through underground electric or gas networks and shutting down alarms. Another runs an internal message system and a coded, digital radio network accessible only to members.

A third group provides a database, a fourth organises subterranean shows and a fifth takes photographs of them. Mr Kunstmann refused to talk about the other groups.

He did, however, say that Lanso was the leader of a branch called the Untergunther – the name comes from a German record whose music served as an alarm on an early mission – which specialised in restoration. This group, whose members include architects and historians, rebuilt an abandoned 100-year-old French government bunker and renovated a 12th-century crypt, he said. They claim to be motivated by a desire to preserve Paris’s heritage.

Last year the Untergunther spent months hidden in the Panthéon, the Parisian mausoleum that holds France’s greatest citizens, where they repaired a clock that had been left to rust. Slipping in at closing time every evening – French television said that they had their own set of keys – they set up a workshop hidden behind mock wooden crates at the top of the monument. The security guards never found it. The Untergunther used a professional clockmaker, Jean-Baptiste Viot, to mend the 150-year-old mechanism.

When the clock began working again, officials were horrified. The Centre for National Monuments confirmed that the clock had been repaired but said that the authority had begun legal action against the Untergunther. Under official investigation for breaking and entry, its members face a maximum sentence of one year in prison and a €15,000 (£10,500) fine.

“We could go down in legal history as the first people ever to be prosecuted for repairing a clock,” said Mr Kunstmann.

Untergunter web-site featuring collected news clipping.

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Hat tip to Matthew MacLean.