[Updated May 26, 2011] A new, cleaner, longer version of the video has surfaced on YouTube recently. You can see it embedded below. It includes some footage of attempts to "water bomb" the rock loose as well. [/Updated]
Dave’s Landslide Blog was where I found this amazing video from Norway showing a 1.8 tonne (4,000 lb) "sledgehammer" suspended beneath a helicopter being used to scale loose rocks off of a huge cliff above the approach to a tunnel. Don’t miss this one! I don’t know anything else about the video since my Norwegian is a little rusty. Anyone?
Some more information is added here: http://www.youtube.com/watch?v=N8JLfT0r058
Thanks Torehum, I saw that a better quality video was posted. This is fantastic, I appreciate you sharing.
It beats climbing up there and rappelling down through all the trees with a porta-power.
I wonder if they removed the rockfall barriers before turning a couple of those big ones loose. Or what they did about protecting the roadway.