RELATED: Are we on the brink of a 6th mass extinction?
Russian researchers have returned from their investigation of the first find and taken water and soil samples to help resolve how the hole was formed.
Some say aliens. Some say they’re “hellmouths” — gateways to the undead.
But scientists already have a pretty good idea.
Explosive vents of vast quantities of methane gas.
Now a new, ominous, name could be attached to them: Dragon’s mouths.
Here’s where a blog posted by American professor in glaciology Dr Jason Box at the weekend comes in: “The dragon breath hypothesis has me losing sleep.”