Watching the video of the escape makes be jealous of the 4 gentlemen who carried out the tunnelling.
That, ladies and gentlemen, is PRECISION surveying. Yaani they tunnelled exactly under the bathroom where it is out of view of the surveillance camera.
And some form of communication must have been going on especially in the last 3 months between El Chapo, the "Engineer" and people preparing for his life after prison, and this must have been facilitated by the Prison Officials.
Receive with simplicity everything that happens to you.” ― Rashi