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Through the tape -- our first glimpse of the hole that take them from one prison building to the next. investigators squeeze themselves through it to reach the other side. they push forward. retracing the prisoners' steps and just look them, dealing with unbearable heat. at 14 minutes they're underneath the asphalt yard between buildings. >> reporter: it is a maze that even these investigators have trouble mastering. there is piping hot steam. at times, it's hard to breathe. >> we're basically southbound from that tunnel. >> reporter: about 17 minutes in, they reach the now legendary steam pip...

>> now just exited the block area and enter the pipe chase tunnels add jay sent to b-block and c-block. >> reporter: it's a maize that even these investigators have trouble mastering. there's piping-hot steam. it times it's hard to breathe. >> we're basically southbound from that tunnel. >> reporter: about 17 minutes in, they reach the now legendary steam pipe used by the escapees. this is where it gets tricky. sweat had told investigators he spent nearly a month cutting holes in this steam pipe. all part of his secret nightly trips spent mapping out their elaborate escape. >> i'll get this pi...

Between buildings. >> we are now just exited the block area and enter into the pipe chase tunnels adjacent to b block and c block. >> reporter: it's a maze that even these investigators have trouble mastering. there is piping hot steam. at times, it's hard to breathe. >> we are basically southbound from that tunnel. >> reporter: about 17 minutes in, they reach the now legendary steam pipe used by the escapees. this is where it gets tricky. sweat had told investigators he spent nearly a month cutting holes in this steam pipe. all part of his secret nightly trips spent mapping out their elaborat...

One prison building to the next. investigators squeeze themselves through it to reach the other side. >> watch your legs. >> reporter: they push forward, retracing the prisoners' steps. and just like them, dealing with unbearable heat. >> it's getting warm. >> reporter: at 14 minutes, they are underneath the asphalt yard between buildings. >> now just exited the block area and entered into the pipe chase tunnels adjacent to b block and c block. >> reporter: it's a maze that even these investigators have trouble mastering. there is piping hot steam and at times it's hard to breathe. >> basicall...

Elaborate maze of pipes and tunnel system. >> approaching the first significantly tight squeeze, the end of b block leading into the c-block area. >> reporter: about halfway through the tape -- >> almost nine, almost ten minutes in. >> reporter: our first glimpse of the hole that takes them from one prison building to the next. investigators squeeze themselves through it to reach the other side. they push forward, retracing the prisoners' steps, and just like them, dealing with unbearable heat. >> getting warm. >> reporter: at 14 minutes, they're underneath the asphalt yard between the buildin...