There’s really not a whole lot to say besides, “Holy shit this is awesome!” In East Java, Indonesia, Kawah Ljen regularly emits blue flames. It’s a nightly occasion that, from a distance, looks like the smurf population went ablaze. What causes this uncommon phenomenon?

The gases that bubble up from beneath the volcanic earth are under a great deal of pressure, literally. When the gases erupt, flames skyrocket and leak the gases into the oxygen rich air. Upon shifting to a liquid state, the burning sulfur produces this rich blue glow only visible in darkness. The majestically blue flames that slide down the volcano are not actually lava, but instead the result of the burning of sulfur.

Local workers mine for sulfur to sell to refineries. They have created pipes that funnel the sulfur into pools where it hardens. The toxins present in the air can be very damaging and most workers don’t have proper gas masks to prevent lung damage. They collect hundreds of pounds of sulfur a day wearing only wet cloths over their mouths.

This alien site becomes more extraterrestrial when flowing towards the Kawah Ljen Crater Lake. The lake has a unique color due to the hydrogen chloride gas that continually erupts into it. It has a pH level of 0 and a high concentration of hydrochloric acid. So don’t go swimming in it. Know more.