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Apple QuickTime movie  |  1996-06-03  |  16.4 MB  |  300x228  |  15fps  |  1 minute, 15 seconds
Transcription: After the surveyors have done their job, the excavation begins. When workers find solid bedrock where the road needs to be built, it has to be removed. This is the job of a blasting crew. Holes are drilled deep into the rock and filled with explosives. Special care is taken to use just the right amount of explosives. It's important to be careful when the blasting takes place. The crew where safety has to protect them, they do not need not go near the explosion. A blasting signal is sounded to clear workers and machines from the blasting site. The explosion makes the rocks break into smaller pi ...