Transcript for Hawaiian Island on High Lava Alert
David, thank you. To Hawaii, the big island. One town on high alert. Lava less than a mile away. A slowslow-motion disaster on its way. Clayton Sandell is there. Reporter: Tonight, lava threatening thousands of people that live here. Quickly oozing the length of six football fields in just the last two days. You can see just below here, in the cracks, actual molten lava. The flow erupted in June, traveling 11 miles, now less than a mile away. It's the geography that controls the lava. Sometimes speeding up, or slowing down, but it's always a threat. Evacuations could be just days away. Road construction crews are racing to make sure they have a way out. The island is no stranger to the volcano's power. It's been active since 1983. And has been belching explosions of lava ever since, showing no signs of cooling off. And there's still much more ahead on "World news tonight."
This transcript has been automatically generated and may not be 100% accurate.