casey joins us now and you actually have ridden one of these things. >> i did, i went down the face of a 50-foot wave with a jet ski. >> with layered hamilton. >> right. jon was that like? >> it was bracing, it was exciting, the wave was extremely steep, but the one thing i noticed was the g forces are so intense when you're on a wave that big that i really had a hard time turning my head but i could -- but i want to see the lip but i couldn't turn my head. jenna: a lot of people are looking at this video thinking that's crazy. why do people chase these wave? >> in the case of surfers, this is their life. it's a small, elite band, they can surf a 100-foot wave if they can find t i call it a globe at scal eveninger hunt. they can tell when the storms create the waves. >> there have been a lot of people killed doing this. >> it's not a sport for the faint hearted, that's for sure, and the first time i went out with a group on the west coast, unfortunately, a surfer lost his life to ghost tree a.60-foot wave off the coast near pebble beach. jon: but the book is not just about the surfers. i mean, i was astounded to read that there are, what, a ship every cou