reporter: take photos. upload the data. so this is an ezry base map. analyze it. it doesn t appear to have widened. reporter: and repeat. take off. reporter: this week, they watched as a massive fast-moving lava flow cut off highway 132 creeping down it for two miles leaving a pile of shifting lava some ten feet high. it will be seemingly cool at the surface, but there s actually still a lot of heat in there. reporter: some of that lava is headed toward another highway, the only remaining escape route for some communities. officials have now given some neighborhoods an ultimatum. leave or be prosecuted. this is an order that is a formal order that does mandate that they leave. reporter: fed by a massive fissure shooting 200 feet into the air, the drone team calculates how quickly the lava is flowing.
i feel like we are. reporter: as the lava moves, the group s routine stays largely the same. fly just at about 100 meters altitude. reporter: take photos, upload the data. so this is a base map. and analyze it and repeat. this week they watched as a massive fast-moving lava flow cut off highway 132, creeping down it for two miles, leaving a pile of shifting lava some 10 feet high. it will be seemingly cool at the surface, but there s actually still a lot of heat in there. reporter: some of that lava is headed toward another highway, the only remaining escape route for some communities. officials are now given some neighborhoods an ultimatum leave or be prosecuted. this is an order that is a formal order that does mandate that they leave.