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Scientists say the sea ice over the arctic ocean is melting so fast that in 15 years or so you will be able to take a boat right across it in the summer. The big thaw is also expected to unlock trillions of dollars worth of oil and gas and minerals. And the United States is jus one country staking a claim. Lesley stahl paid a visit for 60 minutes. Reporter the arctic ocean sits on top of the globe encircled by russia which encompasses half of its coastline. Norway, greenland, canada, and the United States thanks to alaska. We flew as guests of the navy, miles in the direction of the north pole. Over fractured thinning ice, to a spot where the ice was still thick enough to support this base camp. It was a small temporary village, disrupting the peace and the purity of the ice, white as far as the eye can see. The camp was built for scientific military exercise called icex, 2016. Hi, everyone. Nice to meet you. Welcome. Welcome. For five weeks this nomans land of ice was home to an ex scientists and engineers. Whose mission was to understand how to survive in maybe the most hostile conditions on earth. The navy says those taking part in this exercise are the first humans ever to set foot on this part of the planet. It is actually beautiful beyond belief isnt it . It really is. Reporter Chuck Mcguire one of the first to arrive. He is an engineer with the university of washingtons from scratch. So you get off the plane. There is nothing. There is no shelter. There is no indoors. Just ice. Ice everywhere. Thats right. You say how am i going to survive . You pick up a hammer and start building. Reporter they built a make shift city, called sargo for roughly 60 people, consisting of a command post. Tight living quarters. Mess hall stocked with food air lifted in weekly. Very primitive toilet facilities. That outhouse is really cold. Outhouse is awful. What about water. Cant just eat the ice . You can if you know what you are looking for. This ice mining team knows what to look for. Old sea ice baking in the sun long enough that the salt leached out. Ice team, we are returning back to camp. Drinking water. All of the things you take for granted in normal civilization, shelter, food, ease of going to the bathroom. That is all different out here. Reporter what qualities do you think it takes to state here and, and survive out here . For weeks . I think maybe you have to bea little off. Initially. Really understand that everything outside trying to kill you here. Reporter if the ice and wind dont get you. Polar bears might. An armed sentry patrols if one comes looking for food. Good evening. Another successful day. Reporter a Daily Briefing in the command post to coordinate the various researchers who are studying and trying to understand this part of the world. As they plan for a more the ice moved nine miles to the west northwest today. Reporter how Climate Change is affecting the way the ice here drifts and migrates. It feels like you are on land. You get the sense that you are on land. It is very firm. You know, plane could land. But we are moving. Which is kind of astonishing. Every day you wake up. And recognize you are eight or nine miles from where you were the day before. Looks the same. But pretty interesting to figure that out. Reporter the ice moves tha in unpredictable directions because of the currents underwater and the wind above. Done here we are 23 degrees celsius. Reporter also unpredictable is the weather. We met a team of meteorologists, using balloons to help with forecasting which is key for any military operation. These balloons measure temperature, dew point, the parker, meteorologist with the Navy Atlantic submarine force says there is virtually no weather Data Collected up here. In other parts of the world. Meteorologists rely on satellites for forecasting. Up here near the north pole, satellite coverage is minimal. How cold does it get up here. Right now. Dont know if people can see . The lowest we had is 26 below. Fahrenheit. And today is actually our warmest day. Come on. Right now, 6 below. With the windchill factor. The wind is blowing. It is. Terrible. 25 below with the wind chill. You are telling me this is the warmest day . This is the warmest day so far. Do you want to go inside . I do. Lets go. Reporter the temperature can drop as low as 50 below. That can wreak havoc on just about everything. Weapons, communication systems, were here to test their latest cold weather gear and their endurance in the frigid water. These robotics engineers are conducting underwater experiments in a temperature controlled tent. When we were there, doug horner and his team were field testing underwater drones for the first time in the arctic. When weep first put it in we checked the ballast. The drones are collecting Scientific Data about the arctic where the water gets warmer the deeper you go. Theyre also getting a picture what it looks like down below. My primary emphasis here is ability to map the under ice. So we have sensors, sonar, specifically, sound. Which is focused upwards. What we hope to do with with continually putting sound upwards is to make a map. Youre mapping the bottom of the ice . Yes, the underneath portion why is that important . This is the idea of being able to navigate an underwater robot accurately without gps. Because the then the ice you dont have the opportunity to come up to the surface for a gps fix. He says the drones could also be used to patrol the waters of the arctic looking for enemy subs for instance. The way drones hover in the sky over a battlefield. The navy is testing this technology and amassing all of this research to prepare for an expanded presence in the arctic as the ice continues to melt. The russians are already there in force. Last year, they staged a military exercise in the arctic, as seen in this Russian Ministry of defense footage. It involved about 40,000 troops, 15 submarines, 41 warships, and multiple aircraft. No one disputes their right to do that on their own territory. We preannounce ours. No one is surprised by them. Where as the the exercise that russia did was a snap exercise. Which is a bit destablizing. Until may of this year, retired four star general, phillip breedlove, the commander of nato with responsibility for the arctic. What else is destablizing he says is russias military buildup along something called the northern sea route. Skirting the coastline. The route could become saving time and money for the commercial shipping industry. Heard as much as 2 days decrease in transit Northern European markets to asian markets. That is an incredible economic opportunity. It could be a very big boon to, to business around the world. 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But did you know your eyes, your brain, and your joints really love them too . Introducing megared advanced 4in1. Just one softgel delivers mega support. The city of rome recently dropped out of the competition to host the 2024 olympic games. The mayor says it would be a waste of money. Money the city doesnt have. Rome doesnt have the cash to restore some of its crumbling historic treasures. Luckily, some jewelry and fashion houses are stepping up. Seth doane has the story from the recently refurbished spanish across rome tourists see spectacular monuments, while the cash strapped city sees spectacular expenditures it cannot afford. Rome has drawn up a wish list of monuments rand asking for help in preserving history. Hardly a quick power wash. We watched earlier this summer as workers painstakingly scrubbed away years of grime. And leveled the steps. Bulgari, ceo, says his company who has a store down the street spent more than 1. 5 million, refurbishing the 135 baroque steps at the heart of the city of 3 million residents. When you have it on one end and relatively few people. It is the mission of the the Largest Company in the city. Make sure the city is at its best. American archaeologist and offers tours of this ancient capital. It is likely no coincidence that bulgari chose to work on something close to their stores. Location, location. Location. Reporter the scale of restoration work that need to be done is staggering. Gives you an idea of one, why rome can say we have more World Heritage than any place in the world. On the other hand understand clearly that they need help. Reportehe in renovation work before it can reopen. The fenced off mausoleum of augustus, needs 10 million fix. You can see the broken bridge now students on arias College Program were surprised by the state of some monuments. Wonder what happened to the sites. Why they are on the back burner. Where claudio pressi comes in. 21 Million Euros for this. 16 euros for that. He is romes superintendent of draw up a very big half a billion dollar wish list. Of 100 monuments to fix. It is just the beginning. We have 574 archaeological area. We have 400 monument, fountains. We have 900 sacred monuments. Reporter they have had some success. Todds paid to restore the coliseum. While fendi cleaned up trevi fountain. As t corporations and individuals and other countries to subsidize public restoration work. Is there a danger with all of this . Do you run the risk of having the xyz companies, xyz monument. You dont see huge obscene banners on any of the sites. So the state, city, theyre very much concerned about preserving the integrity of the sites and not to commercialize them. The cbs overnight news my boyfriend cant stop drinking until he drinks too much. A friend suggested alanon family groups. She said there are no dues or fees. At first, i was afraid to go to alanon. I felt like a fool to care about somebody who cant stop drinking. But alanon members know exactly how i feel. Is someones drinking troubling you . You might be surprised at what you can learn in an alanon family group, from people just like you. China reopened its latest tourist attraction. The highest and longest class bridge in the world. Was originally opened earlier this year. They had some trouble with it. Which has reportedly been fixed. Adriana diaz took a stroll across. Reporter both breathtaking and terrifying at the same time. For th00 come each day, a view they will likely never forget. Its got everyone acting like theyre kids again. Chinas newest tourist attraction. Is a selfie dream come true. That is if you can handle it. Shh. Its okay. Its okay. Reporter the grand canyon glass bridge in Central China is stretching more than 1,400 feet. Churning stomachs. Trying to rationalize it and tell my brain it is safe. It just doesnt feel right. And leaving visitors amazed. Are you scared . Translator no, i think it is great said this man. I feel a little scared. But i am strong enough. So, no. I am superman. Reporter this scenery inspired the floating mountains in the blockbuster avatar. The bridge could have been an inspiration for hitchcocks vertigo. To protect the glass. Booties are required. High heels are banned. And tickets are limited. After opening in august, the bridge closed for a month because of overcapacity. Last year, a different class walk way in china shut after a panel shattered. Once you get used to it. Not that scary. Reporter here vice general manager, joe chen says theyre three layers of the glass panels. Each layers can with stand more than 40 tons. Reporter to prove it. This summer officials had visitors try to smash the glass with the ledge hammer and ride a car over it to drive hope the point. But chen says the bridge is more than just a tourist attraction and symbolizes an ascending china. Does that make you feel proud . Yes, this bridge will represent the creativities and inventive power of new china. Reporter the bridge is home to the worlds highest bungee jump which thankfully isnt open yet. Also marketed as the longest fashion runway. Watch out, fashion week. A new catwalk in town. Thats the overnight news for tuesday. For some the news continues. For others check back later for the morning news and cbs this morning. From the Broadcast Center in new york city, im don dahler. The debate breaks the tie. Our first postdebate poll shows clinton taking the lead. As leaked tax returns give her new ammunition against trump. What kind of genius loses a billion dollars in a single year . Laws to my benefit. And to the benefit of my company. Also tonight, Hurricane Matthew batters the caribbean. Well tell you where it is headed. Police give themselves a strategic advantage to catch distracted drivers. You have to pay over 100. So, dont look at your phone. And she rose from poverty to hope wins in everything you are doing. Now hollywood is telling her story. . . Announcer this is the krb overnight news. 35 days before the election. Hillary clinton has taken the lead over donald trump. A cbs news poll has clinton up 4 points before the first debate last monday they were tied. Of voters who watch the de. 32 said their impression of clinton improved. While 36 said their opinion of trump got worse. On monday, trump defended his use of the tax code to legally pay as little in taxes as he could. Here is major garrett. I have legally used the tax laws to my benefit. Reporter in colorado, donald trump was unapologetic after the New York Times report heed claimed a business loss of nearly 916 million on his 1995 those losses could have shielded trump from federal income taxes for years. I understand the tax laws better than almost anyone. Reporter trump not released any tax returns and a trump lawyer threatened the times with legal action for unauthorized publication of trumps records. The documents were mailed anonymously, susan craig and david barstow. I was walking by my mailbox. An envelope from the trump tower. To have them tumble out of an envelope, your first reaction is skepticism. Reporter in february trump pra bragged to us. You work hard to pay the least amount of taxes . I want to pay the least amount. Reporter trump said when clinton raised his tax history at last months debate. He didnt pay any federal income tax. That makes me smart. Clinton supporter, ordered trumps Charitable Foundation to stop soliciting contributions in new york because it is not properly registered with the state. Schneiderman is investigating charges trump used Charitable Funds for personal gain. Trumps campaign send the foundation will comply with the order. Earlier today in Northern Virginia trump was asked about Mental Health care for veterans and said those who suffer from posttraumatic stress are not as strong as those who do not. Scott for years have tried to erase the stigma of weakness once associated with posttraumatic stress. Major garrett following the campaign tonight. Major, thank you. Off to day Hillary Clinton tried to turn trumps financial losses to her political gain. Heres nancy cordes. What kind of genius loses a billion dollars in a single year . Reporter trumpps tax plan gave clinton a chance to chip away at his biggest selling dollar let alone a billion dollars in the Casino Industry is kind of beyond me, right . You work hard. You pay your taxes. Clinton and Top Democrats quickly cut ads to capitalize on the news they had been anticipating for months. I want a president who is proud of our country. Not a president who is proud of getting out of paying taxes. Reporter her stops in akron and toledo marked clintons first visit to ohio greeted by a new poll that shows her trailing there by five points. Though she did pick up a new endorsement from the states best known athlete, cavaliers star lebron james. I mean our kids are our future. And i believe barack started it. I believe hillary is going to continue it. Here in ohio, lebron will always be the king. Clintons biggest challenge in ohio is the outsized share of White Working Class voters. Favor trump by nearly 2 1. Ohio is not a mustwin for clinton. The way it has been for other candidates in years past. Thats partly because she is leading big in other battleground states like this one, virginia, and colorado, where another new poll today scott showed she is leading there by 11. Nancy cordes, thanks. With insight into all of this, turn now to John Dickerson, our cbs news political director of course john, the tax controversy, what effect is that likely to have on the race . Well this is a distraction for donald trump. At a time when he really cant afford it. On any given day a campaign wants to drive the news