Return guest, Zach Caldwell, is a Professional Scubadiver, who dives in the name of science. His work has taken him all over the world, diving in some extremely remote places. If you haven't already, go listen to Zach's first episode with us, #5, to learn about who Zach is, and follow up with #42 to see what he's up to now!!

IG: @zachrcaldwell