The night after Whakaari White Island erupted, heavy rainfall combined with ash, creating a sediment wave that likely flushed the bodies of the two missing victims down a stream into the ocean.
Local tour guide Hayden Marshall-Inman and 17-year-old Australian Winona Langford are still missing despite extensive searches and aerial photos initially showing the bodies in stream.
Lisa Owen asked GNS volcanologist Graham Leonard how active Whakaari is.
