PREVIEW
... after a pipe collapse.
The giant pit is the product of the collapse of the pipeline.
Lava pipes, also known as lava tunnels, are themselves cooled lava, because the surface of flowing lava is easily cooled and formed into a hard shell.
However, affected by the thermal insulation condensed into a solid shell, the lava flow flowing inside will be hotter than the outer layer, and the flow will not be affected by external factors because of this protective shell, so the flow spe ...
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