. >> they own marine in cokodiak alaska.'s dangerous and it's broken, call these guys. >> work ain't easy and it sure as hell ain't safe. >> i'm working as fast as i can. >> we're talking about boats going to the bottom of the ocean. >> holy [ bleep ]. scottie, it's pushed in pretty bad. >> we make a mistake, we could die. >> we got to go, let's go! >> 15% of underwater welders dionne the job. >> i think i'm ready. time to get wet. >> brand new series on the discovery channel. joining us "right this minute" via skype we have dennis and his wife teresa. guys, how do you get into a business like this? >> it started as a marine repair business, but in the marine industry there are no weekends or holidays. and then you end up working all of these times and the 234eks thing you know everybody is calling. >> we started with one truck, a trail, and one welding machine 20 years ago. the business just built itself. >> how do you choose the guy that's going to dive considering 15% chance he's not going to make it? >> first you've got