Surfers paddle past icebergs covered in volcanic ash at the base of the Vatnajökull glacier in Iceland. The Grímsvötn volcano, which began erupting last Saturday, is located underneath the Vatnajökull glacier, the largest in Iceland. Many feared that the Grímsvötn eruption would lead to massive air travel shutdowns, similar to those caused by last year's Eyjafjallajökull eruption. But the supposed threat of Grímsvötn proved to be little more than hot air: The volcano released far more steam than ash, and flight cancellations in Europe were minimal compared to the chaos caused by Eyjafjallajökull.