TIL: Structural engineer teaches about rock-bolts that keep tunnels from collapsing and that you *could* bolt gravel together to be reinforced enough that you could stand on it.

https://youtu.be/xNDppVTVUss?t=233

Submitted September 26, 2019 at 12:22PM by myonlineidentity9090 https://ift.tt/2mZ1no0