though, nothing bad happened to these guys, a couple of french mountain bikers this area at an undisclosein france't want to say hey, go try it yourself. because no, it's obviously very dangerous. ♪ >> you see they came across some bats. it looked like there had been a collapse there before or they just found their own way through. but barely wide enough to get their handlebars through, they get on down to the other side and it opens up into another cool chamber to ride. >>> this raccoon was after something. but -- the poor thing is stuck. >> find out if it ever makes it out of the hole. >> plus he's preparing for the world's biggest back-flip ever. ready? >> i said, are you ready in. >> all right. let's go. >> see if the prep pays off. especially for people with heart failure. but today there's entresto... a breakthrough medicine that can help make more tomorrows possible. tomorrow, i want to see teddy bait his first hook. in the largest heart failure study ever, entresto was proven to help more people stay alive and out of the hospital than a leading heart failure medicine. women who are pregnan