If you were to try to come up with the most outlandish survival story imaginable, you’d be hard pressed to do much better than the tale of Michael Proudfoot, a scuba diver who found himself trapped alone in a shipwreck deep under the sea and running out of air. It’s the ultimate nightmare scenario for a diver, and yet somehow Proudfoot managed to live through it. Or maybe not. Maybe none of it ever happened. This week on the Outside Podcast, we revisit a classic episode from our archives that had us take our own deep dive into a legend that seems too astonishing to be true—but just might be.

This episode of the Outside Podcast is brought to you by Hydro Flask, maker of the new Trail Series bottle, which lets you go farther with less weight. Learn more about it and purchase yours at hydroflask.com/trailseries