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Stretches nearly 2,000 miles nearly 700 miles covered with border wall or steel fencing, but donald trump wants more. >> on day one, we will begin working on an impenetrable, physical, tall, powerful, beautiful southern border wall. >> well, of course it can be done. >> reporter: professor michael deer is an expert in regional planning and the author of the book why walls don't work. >> a large concrete structure 25 feet high which should be very intense in resources and money. >> reporter: in fact, cnn has surveyed a number of engineers and architects. the wall would most likely be made of pr...

Call it the trump wall. >> reporter: the border between the united states and mexico stretches nearly 200 miles. nearly 700 miles is already covered with some form of border wall or steel fencing, but donald trump wants more. >> on day one we will begin working on an impenetrable physical, tall, powerful, beautiful southern border wall. >> of course it can be done. >> reporter: professional michael dear is an expert in city and regional planning and the author of the book "why walls don't work." >> a large concrete structure which might be 25 feet high which will be very intense in resources a...

Medical examiner, because i thought that's really what i thought, we had a fatality. they said, no, she's alive. >> it's unbelievable that anyone could actually be alive under this heavy concrete structure, but now rescuers have some serious thinking to do. >> that was a tough decision to make how we were going to lift this heavy object up without causing any harm to the victim. i mean, it was really shaved right close to her head. we could have actually killed her in the process of doing the rescue. >> before they get started, firefighter mike cockerel climbs inside the concrete cone to make ...

Meanwhile, only a mile away, another team of rescuers is trying to reach salvador pena. >> a big beam, a concrete beam came right across his legs. he's still down there, he's conscious, he's talking but his legs are completely crushed. you can hear him moaning right now. >> pena is on the first floor of a mall parking deck operating his sweeping truck when the quake strikes. and now the entire concrete structure is on top of him. >> we have no idea if we'll even come close to getting to him. >> firefighter ray lavalle struggles through the mangled metal and busted concrete to make contact with...

To the rescuers. so henry and his crew continue on looking for victims. meanwhile, only a mile away, another team of rescuers is trying to reach salvador pena. >> a big beam, a concrete beam came right across his legs. he's still down there, he's conscious, he's talking but his legs are completely crushed. you can hear him moaning right now. >> pena is on the first floor of a mall parking deck operating his sweeping truck when the quake strikes. and now the entire concrete structure is on top of him. >> we have no idea if we'll even come close to getting to him. >> firefighter ray lavalle stru...