A small patch of water boils and bubbles like a hot tub as volcanic gas hits the surface after rising about 3 kilometers from the magma chambers. A longtime tourist attraction, the outflow of gas – mostly carbon dioxide – is now worrying scientists after it quadrupled to ten liters a second since October, while the sulfur in the gas intermittently turns the surrounding sea from transparent to milky white. The last time Franco Italiano, a volcanologist, saw such a large patch of white sea was off the neighboring island of Panarea in 2002, when suddenly
