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I'm not an engineer, but my best guess for the reason behind the deep interception of the borehole would be to avoid the risk of the diverted pressures blowing out around the blockage. In effect they would be using the thousands of tons of material in those two miles of earth to stabilize things.
In a similar fashion, suddenly crimping an already stressed pipe to block the flow could cause a rupture when the moving mass of material has nowhere to go.
Keep your fingers crossed.
Les
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Best
Les
My train of thought has been replaced by a bumper car.
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