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A levalencia took us inside. >> reporter: this is the modified motorcycle that they showed us images before. it's on a track and rolls back and forth. buckets are left behind. look at this. left behind oxygen tanks as well in order for them to survive down here. the tunnel stretches for more than a mile. carved out earth here. this modified train track for that minimotorcycle, you see here, electricity lines. it's very difficult to breathe down here. a lot of dirt. dust. this here for the ventilation system. tight, tight space down here. this motorcycle was on a track here. this is the bike th...

Gary bierlee, a forensic expert in tunnel engineering. it is cartoonish simple and would be laughable, except we are talking about shorty guzman and we are talking about a jail escape. he just built a tunnel for his escape. how long do you think this would have taken to build? >> this tunnel was extremely difficult for several reasons, but i'm estimating it would have taken approximately two years to build this tunnel. and keep it a secret. the level of activity there that was taking place at the house had to be very carefully managed. >> you say the house. explain that for us because some peo...