It seems it must be really hard to measure accurate distance and depth in them. GPS doesn’t work there either. How do we do it?
In: Geology
Old school surveying. Measured out by ropes and math. If you take it one section at a time you can measure the opening and then from there measure the next area. Keep going and pretty soon you have it done.
The math is basic trigonometry, which a 5 year old isn’t going to get. Let’s just say that they carry a pole that is 2 meters long and use it like a ruler. They can also measure angles and direction and get distances that way.
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