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Tunnel vs. Wall
In late 2016, in an impressive sublimation of traffic-caused road-rage, Elon Musk announced via Twitter that
Am going to build a tunnel boring machine and just start digging...
It shall be called "The Boring Company"...
I am really going to do this.
Per early-2017 reports, Musk has now acquired a tunnel-boring machine, started digging a tunnel near his LA SpaceX office, and is investigating improvements in mining technology. The vision is to eventually have many kilometers of tunnels under cities, as well as provide much better tunneling for hyperloop transportation systems.
This is arguably more progress, albeit with less of a potential pot of money, than another massive infrastructure project (probably) announced via Twitter: Trump's border wall. As of early 2017, there are very preliminary plans, but no proposal submitted to congress.
In a separate question we ask how much wall will be built. Here, we'll put these projects head-to-head:
By start of 2025, will there be more Tunnel than Wall?
Tunnel length will be counted as dug-out (but not necessarily finished) tunnels built by the Boring company or any other entity substantially under the control of Elon Musk. Wall length will be counted as per the associated question – note in particular that fence does not count.
Metaculus help: Predicting
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Metaculus help: Community Stats
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When you make a prediction, check the community stats to see where you land. If your prediction is an outlier, might there be something you're overlooking that others have seen? Or do you have special insight that others are lacking? Either way, it might be a good idea to join the discussion in the comments.