On this picture you can see the ash cloud after the eruption of the volcano Puyehue, June 4th 2011. At 15:15 local time OVDAS reported an explosion and a 5 kilometres wide ash-and-gas plume that rose to an altitude of 10 kilometres above sea level. The plume drifted south at 5 kilometres altitude, and southeast and east at 10 kilometres altitude, in Bariloche the sky was pitch black dark at that time. The alert level was raised to 6, red. The ash cloud was actually not from the Puyehue but from the Cordon Caulle fissure. An estimated one hundred million tons of ash, sand and pumice were ejected – requiring power equivalent to 70 atomic bombs! At the end the ash cloud made it a couple of times around the southern hemisphere closing down airports. Surprisingly the ash cloud had to got once around the world before actually arriving in Chile and affect airports there.