lava-tunnels

Updated: May 2, 2025

Though occurring in lava, this cavern is quite different from lava-tunnels, such as the Surtshellir, which are recognised formations, produced by the cooling of the terminal surface-crust of the stream of lava, and the subsequent bursting forth of the molten stream within.

G. F. (George Forrest) Browne - Ice-Caves of France and Switzerland