el chapo escaped through a tunnel dug right under the prison and up into his cell. the job to retake him was now in the hands of the mexican marines and virtually the same group of u.s. agents minus drew. but this time they weren't starting from scratch. >> they understood his organization, they understood the network, they understood the movements. he wasn't as clever as he thought. >> learning from, and building on, the 2014 playbook, the mexican and u.s. team cornered el chapo on january 8th, 2016. just six months after he escaped. but this time he didn't go down without a fight. and it was wild. this helmet cam footage shot by a mexican marine captured the operation as it quickly devolved into a shootout killing five of el chapo's men and injuring one marine. el chapo was once again in custody.