Digging the Devil's Slide Tunnel: Science on the SPOT

California Highway One, between Pacifica and Montara, was carved out of the steep coastal cliffs. Plagued by closures due to rockslides and land slippage, this route has earned the nickname "The Devil's Slide." Now two tunnels beneath San Pedro Mountain, each 30-feet wide and 4,200-feet long are being dug to bypass it. QUEST meets the engineers and geologists deep underground to learn how Caltrans is digging this new tunnel.

[@terryfenwick]

I loved Highway One - prayerfully they will let us use it also as I will never want to go into the tunnel

[@EricPace]

WOW. That will make the trip MUCH faster

[@shopdog831]

If you want fast take the freeway this road was put here because it looked cool

[@ekbalam7077]

Good job !

[@theogdirkdiggler]

Why has it been 40 years since a tunnel was made?

[@buddyclem7328]

Because tunnels are expensive.

[@SuperRip7]

Don't close Highway One.

[@izacnewton5761]

what comments are not disabled

[@TheGlave80]

I live in Pacifica and this guys are garbage along with Kiewit, it took so much longer than original plan and went way over budget.

[@robertgreen9150]

Loved P-1, as I called it in 1970's!!

[@jeremyamac]

I live in Montara. Can't Wait!

[@SuperRip7]

Don't the tunnel will soon be built and finally Californians can get through.

[@baconology]

also, respect to hoek of rocscience whose tools were no doubt indispensable to this project

[@theogdirkdiggler]

Wow

[@buddyclem7328]

WTF???