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The other thing that we're looking for when we go into these tunnels too, we're looking for what's referred to as bio-bromiculation. This is where colonies of bacteria live and it's tell-tale signs of their existence. But in the lab, these researchers, they felt the samples of water between usually heavy hydrogen atoms, this is a deuterium. They then incubated the samples that they took from this area at 25 to 39, 54 degrees Fahrenheit, that's minus 4 and 12 degrees Celsius. And they kept examining them on a regular basis for microbial activity. And they wanted to simulate what happens in Alaska summer under future climate conditions where temperatures will start reaching much deeper into the permafrost.