Jim has probably the best response to your question.
From: jimlux <jimlux@earthlink.net>
Date: Sat, 10 Feb 2018 05:52:16 -0800
List-post: <mailto:towertalk@contesting.com>
>From: Joe Partlow <joe.w6jwp@gmail.com>
>Date: Fri, 9 Feb 2018 11:04:44 -0800
>
>So I'm in the process of digging the hole for my tower foundation. I've dug
>most of it out with a mini-excavator but now I have to climb down inside to
>finish up the corners and such. the hole will be 4' X 4' x 6' deep. Should
>I be worried about cave-ins?
It depends. What's your soil like?
if it collapses, how deep will you be buried?
If you're buried waist deep, you just have to wait til someone comes to dig
you out (or you can dig yourself out with your hands).
If you're buried with your chest under dirt (i.e. the collapse knocked you
over, or there's a big pile of dirt next to the hole, so the hole will be
filled back up), you will likely die before someone can dig you out, even if
they're standing there, shovel in hand, ready to start digging.
I'll readily admit that when I was younger and more ignorant, I climbed down
into plenty of holes. I won't do it now.
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