Once underground, Adam filmed Iain scuba diving to explore an underwater cavern.

Adam filmed segments for the series on the Yucatan Peninsula of Mexico.

He captured host Iain Stewart exploring water-filled caves called cenotes. Iain and his guides from Pro Tec Diving climbed 20 meters down into a massive underground chamber.

At the Mayan ruins of Tulum, the team filmed Iain emerging  from the jungle to explore a massive pyramid. To get the most dramatic angles, Adam covered the sequence with a jib arm, by helicopter, and atop the remarkable ruin.

And in upstate New York, Adam and Colette recorded exploration of a poison lake.