Avoiding the Voids

RICH GARLOCK: Some craters had been located; others were not. If you were on top of debris, it could be compact 70 feet down, or it could be a shallow shelf masking a crater beneath. Here, I'm standing three levels down on intact structure, near the area of the Secret Service parking lot. To the right, you can see light shining through an open crater. However, looking to the left, the hole is hidden by intact structure overhead. When we saw voids like these, we would go straight to the foreman and say, you have got to yellow off this area, you can't send machines in here."

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