Things have shown no signs of settling down around the Kilauea volcano on the big island of Hawaii, and now experts are worried that the presence of blue flames could be a sign of more ominous things to come.

Adding to their fears is the concern that Hawaii’s last remaining open highway could be blocked if new fissures open. If that happens, approximately 1,000 people would have to be helicoptered to safety.

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“It’s the first time, maybe the second time I’ve seen the blue flames thing. It’s very dramatic, very eerie,” geophysicist Jim Kauahikaua said.

But why have these rare flames popped up?