Stunning new footage of White Island's bubbling crater lake has been captured on video by an overhead drone.
Like something out of a witch's cauldron, the video, tweeted by Geonet, shows an eagle-eye view of the slime-green crater lake bubbling aggressively.
GNS Science volcanologist Brad Scott said steam vents have been drowning in the lake over the last year, with water levels rising about 12m, causing steam-driven activity like bubbling and geysering.
He said the water in the lake is acidic and the light green colour is created from the sulphur combined with various algae and bacteria living in it.
Scott compared the lake to the geothermal hot springs in Rotorua and Taupō, saying the same goes for those in terms of the colour they are - different bacteria, different colour.