MATomlinson:
Fernando Hernandez installs a pressure transducer in lower La Grieta stream passage, Sistema Huautla, Oaxaca, Mexico
MATomlinson:
Fernando Hernandez prepares to swim back through the Pato Mojado passage in La Grieta, Sistema Huautla, Oaxaca, Mexico
MATomlinson:
Chris Lloyd climbs up out of an azure pool through the clean-washed upstream Refresher passage towards Camp 3 in La Grieta, Sistema Huautla, Oaxaca, Mexico
MATomlinson:
Elliot Guerra-Blackmer admires anastamosis in the ceiling of the Mexiguilla passage in La Grieta, Sistema Huautla, Oaxaca, Mexico
MATomlinson:
Alma Rodriguez rests between readings during the survey of Cueva de los Seres, Oaxaca, Mexico
MATomlinson:
A friendly local Mazateco waves from his milpa field high above the PESH expedition basecamp in Plan Carlota, Oaxaca, Mexico