Inside Algar do Carvão

Inside Algar do Carvao, a lava tube cave

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The Algar do Carvão cave is a lava tube. It was formed during the eruption of Terra Brava.

When an eruption is long lasting, the lava starts to flow in confined channels. When the lava stops flowing, lava tubes remain. Lava tubes are always only a few meters below the surface. Therefore it's quite common for parts of the roof to collapse.
Algar do Carvao has had only a small collapse, as can be seen in the panorama. The cave is filled with stalactites and stalagmites. That's a really exceptional feature for a lave tube. The cave is 100 meters long and ends in a subterranean lake.

Silica stalactites A detail shot Weird stalactite