Do you actually have any sources or are you just making assumptions based on how you see limestone behave on the surface?
I don’t have sources myself but to me the porous nature of limestone seems like a benefit since water would easily flow to the water table instead of flooding in the tunnel.
Erosion seems like it would be a far bigger problem for tunnels in soil or sand than it would be for limestone.
Water generally flows down. If you have a high water table building basements is usually foolish.
Limestone, because it dissolves in contact with acidic water (and rainwater is slightly acidic) is also prone to sinkholes. Best to keep the ground stable by not exposing it to more water. It happens so often in Florida there’s an FAQ page. https://floridadep.gov/fgs/sinkholes
I don’t have sources myself but to me the porous nature of limestone seems like a benefit since water would easily flow to the water table instead of flooding in the tunnel.
Erosion seems like it would be a far bigger problem for tunnels in soil or sand than it would be for limestone.
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