New Yorker article on Chev? system, Oaxaca, Mexico

[alanw]

http://www.newyorker.com/reporting/2014/04/21/140421fa_fact_bilger?currentPage=all

Chris Jewel, Expedition Leader of the Huatla cave Diving Expedition gave a very interesting talk at the BPC's annual dinner - Huatla and Chev? are not far from each other in the southern Mexican state of Oaxaca.