Each installation of LIGO is an underground L-shaped laser interferometer with arms 4 km (2.5 miles) long.
It took almost an hour before the guns neared the far end of the L-shaped wellbore, an underground trip of nearly four miles, and began to withdraw.
The L-Taraval, which runs underground for 5.5 miles from the Embarcadero station before emerging at the West Portal station, now takes 36 minutes to take passengers out to the zoo, the same as it did in 1939.
The last thing you want to do is wait for the train, and you hope as you head underground that the L will arrive immediately.
In August 1991, in partnership with BBC Manchester, Metrolink ran a "Nickname Metrolink" competition to find an affectionate short name for the system, comparable to "The Tube" for London Underground and "The L" for the Chicago elevated transit system.
In April 2019, the Metropolitan Transportation Authority will shut down the Canarsie Tunnel, a vital underground link that carries L-train riders between Manhattan and Brooklyn, for much-needed repairs.
To get anywhere beyond the Loop, the quickest route is to take the "L" trains (known as such whether they're underground or elevated).
Check out The L Magazine's investigation into the city's underground sex clubs here.
Working the underground with last year's It's tha L!, Oakland brother duo Lexicon have returned with their solid follow-up, Youth Is Yours (Spytech).
Lest legal workers consider this a distant problem, one conclusion of Venkatesh's work is that the underground and mainstream economies are intimately entwined.
Bardgett, R. D., Mommer, L. & De Vries, F. T. Going underground: root traits as drivers of ecosystem processes.
