Practical and Safety Concerns Of Digging Sandstone Tunnels

I still get a lot of questions about safety when I do Sandland tunnel videos, despite an earlier video on the topic (https://www.youtube.com/watch?v=Rzl0Ofsu0Gw). When @PracticalEngineeringChannel mentioned Sandland recently, it sparked some renewed interest in safety and structural design questions related to hobby tunneling. This video attempts to answer some of the more frequent comments I see.

I've also previously done a video about air quality: https://www.youtube.com/watch?v=ZZ_KWqM2y1g

Check out Practical Engineering's video about hobby tunneling here: https://www.youtube.com/watch?v=Ssw5bdx1HKw

And some other local historic caves I've visited:
Rochester: https://www.youtube.com/watch?v=Hm560PrsE5Y
Jordan: https://www.youtube.com/watch?v=WvGMdEBfpNM
Cannon Falls: https://www.youtube.com/watch?v=H6sUkscZhVI

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