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varjagyesterday at 10:16 PM1 replyview on HN

A tunnel 15-30 feet underground is not "shallow" at all, it's a major earthworks undertaking.


Replies

cucumber3732842yesterday at 10:44 PM

In Reddit hand wringing land where your 3-gal homeowner air compressor gets called a bomb, yeah sure it's a major undertaking.

15-30ft holes in the ground can be constructed with bog standard earthmoving machinery that isn't even "wide load" so it's "within normal capabilities" by professional or military standards.