Unmanned vessel records continuing volcanic activity deep inside HTHH

Clear signs of continuing volcanic activity were seen inside the deep caldera of the Hunga-Tonga Hunga-Ha'apai (HTHH) volcano by an unmanned remotely operated surface vessel, the (USV) Maxlimer on its first initial survey mission in Tonga. Scientists say it is too early to tell if it is due to a continuing eruption or hydrothermal venting from cooling lava or both. They are continuing with their surveys to map the caldera and the hydrothermal vents within it.