Standup comedian Ari Shaffir's Skeptic Tank is on the road for Episode 500! Tim Brown is a Free Diving instructor I met during my time in Guatemala over the holidays. He's a 21-year-old kid from Australia who decided one day that he wanted to try free diving and now he's teaching tourists how to do it. We recorded this podcast about the sport from a dock on a giant crater lake while I smoked menthol crushes and held in tostada diarrhea. By the way, someone let Mark Normand know I have his wedding present.