Under Grimsvotn Volcanic Eruption in the Vatnajokull Glacier, Iceland Flying under the eruption volcanic ash is hanging in the sky forming these unique clouds The eruption began on May 21, 2011 spewing tons of ash, initially the plume was over 20 kilome. Under Grimsvotn Volcanic Eruption in the Vatnajokull Glacier, Iceland Flying under the eruption volcanic ash is hanging in the sky forming these unique clouds The eruption began on May 21, 2011 spewing tons of ash, initially the plume was ov