Anak Krakatau was visited by our club member Stefan Tommasini, who took temperature measurements there. The water temperature at the edge of the crater lake is 62 degrees Celsius. In the middle of the lake an estimated 80 degrees. There your cinder cone seems to rise just above sea level. The pH value is 0.5 and is therefore extremely acidic. The escaping gases contain a lot of sulphur dioxide. The sea water at the coast has a temperature of 35 degrees. Here, too, hot gases and hydrothermal solutions escape. Further eruptions are likely in the near future.