decided we were going to deploy fire shelters. >> their small tents to hope lock enough oxygen for you and block out the fire's deadly heat. 19 firefighters in arizona's yarnell fire of 2013 deployed theirs but didn't survive. >> when it comes time to do it yourself, it really seems surreal because it is your last option. >> the call kevin eventually got out despite dying batteries and a spotty gps to indicate his location. >> el dorado, we're in a safety zone for shelter. >> helicopter pilot gary dolan heard the call from dispatch. >> what did you hear on the call? >> all available helicopters prepare for an emergency launch. i'd been doing 28 years and never heard that terminology before. so i just jumped in and started it up. >> with that, gary was on a tear to get to the trapped men ten miles away. >> on fire. the smoke all over 30,000 feet. okay, we're right over the fire there with the guys. >> we got in our fire shelters