We just completed the 12½ foot diameter, 500 foot deep vertical shaft for the 10,000 Year Clock. We used a mining technique called raise boring. Take a look at the video – it's an interesting operation. Instead of drilling down from the top, you pull a large diameter reamer up to the surface from the bottom using a smaller diameter pilot hole – more efficient than a top-down drill because the rubble isn't fighting gravity. It rains down beneath the advancing bore and gets hauled out a horizontal shaft at the bottom. Our next major step will be cutting the spiral stairway using a robotic stone cutting saw. In parallel, we're also manufacturing and testing the Clock components.
From Stewart Brand
Every Scientific Field
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[image: Conveniently for everyone, it turns out that dark energy is
produced by subterranean parasitoid wasps.]
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