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A comment on Under Seattle, a Big Object Blocks Bertha. What Is It?. Parent comment
They probably have an airlock behind the machine since I doubt the drill head itself is air tight against the walls.
Any bore holes would have to be water proof, or at least pressurized to keep them from filling up.
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They probably have an airlock behind the machine since I doubt the drill head itself is air tight against the walls.
Any bore holes would have to be water proof, or at least pressurized to keep them from filling up.