Not to plug but here is Vice News coverage of the el chapo escape along with a more detailed view of how they construct the tunnels. https://www.youtube.com/watch?v=Kh3RHV5G1Fc
Thanks for that, it was interesting their coverage of the 'hoax' aspect of this escape (not that the escape was a hoax but that the events leading up to it were enabled by support from inside the Mexican government and prisons system.) I also hadn't realized that there hasn't been an independent confirmation of the full length of the tunnel. I would have thought that would be the first thing some news agency would do.