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Don't want to hit with your snowmobile. people climb around on those things? >> ryan: the mountaineers here you know have drills to practice extricating somebody. >> anthony: there's a steep learning curve to flying down here, skillfully handle gale force winds, reduced control at high altitudes and the unpredictability of extreme turbulence around mountains and active volcanoes. >> ryan: slowly but surely climbing and it's minus 20 outside. >> anthony: erebus and that's -- >> ryan: mount terror. >> anthony: vo this is mount erebus, the southernmost active volcano on earth. antarctica was a gr...

I'm sure of it. beneath the station is a subterranean world. 2000 feet of tunnels 30 feet down, carved into the walls impromptu shrines depicting personal messages, remembrances left behind by long gone workers. a frozen constantly moving and shifting network of passageways. >> scott: the walls come in, the ceiling comes down, the floor comes up. >> anthony: requiring constant maintenance. what's supporting this roof? >> scott: compaction of the snow. >> anthony: scott smith runs the crews keeping these tunnels clear and pipes flowing. >> scott: we're in the process of taking the chainsaw dept...

Democrats have enough video of donald trump saying he was going to repeal obamacare completely. >> right. >> that they'll be able to i think pretty clearly make the case that donald trump was trying to do and has in many ways done the same thing that matt bevin was doing. >> and that video will do one more thing and you'll see that tomorrow. which is these things get inside donald trump's head. the real natural politicians, the obamas, the clintons, the george w. bushs, they're like boxers, they take a punch, they shake it off, they're back in the ring. donald trump, these things get inside hi...

It goes through canada, unfortunately, if you are in the northeast, you're getting the core of this cold weather by saturday afternoon. now, morning lows will hover in the 20s. we're talking about the teens, the single digits. feel-like temperatures for boston by saturday morning. so, we're watching this very closely, as this clipper system makes its way in. now timing is key. the bulk of this system really impacts the northeast. late morning, so your early morning commute, pretty much okay. it's the higher elevations that's going to see the bulk of this snow. and then i think things really st...

A year. but it's worth it the ice cores they extract enable a complete reconstruction of the climate of the past down to the exact year. researchers from all over the world come to this special laboratory at the out that they may get institute in play mahasen to examine i samples from the earth's polar regions at minus 20 degrees celsius. ice cores are vital for the reconstruction of volcanic eruptions because they cover such long periods of time. these ice cores come from a place even more remote than greenland the interior of the antarctic. even here researchers have found time boris fingerp...