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It's much more difficult on a cruise ship because where are you going to go? >> reporter: notoriani is especially concerned about fire. she says the industry just doesn't put enough research into developing new engineering systems so that if a fire breaks out there won't be a domino effect, shutting down everything from plumbing to backup generators and propulsion. but don't expect new engineering systems unless cruise companies do it voluntarily. there's no regulatory body to force that sort of change. >> they always say safety is their emphasis. i've never quite believed that. i think the bo...

Are just so much more dangerous. >> it's really hard because the cruise ship is very much of a contained environment. so if i'm in a car crash, my car can be totaled, i might be a bit upset, but i hitch a ride home and i'm back to my normal life. it's much more difficult on a cruise ship because where are you going to go? >> reporter: notoriani is especially concerned about fire. she says the industry just doesn't put enough research into developing new engineering systems so that if a fire breaks out there won't be a domino effect, shutting down everything from plumbing to backup generators a...

>> reporter: notoriani is especially concerned about fire. she says the industry just doesn't put enough research into developing new engineering systems so that if a fire breaks out there won't be a domino effect, shutting down everything from plumbing to backup generators and propulsion. but don't expect new engineering systems unless cruise companies do it voluntarily. there's no regulatory body to force that sort of change. >> they always say safety is their emphasis. i've never quite believed that. i think the bottom line is their emphasis. >> reporter: on may 22nd, the cruise lines inter...

Damage ships, it comes to just about 30 incidents a year. not many. but kathy notoriani, who heads the department of fire protection engineering at worcester polytechnic institute, says fires, accidents, mishaps way out here on the high seas are just so much more dangerous. >> it's really hard because the cruise ship is very much of a contained environment. so if i'm in a car crash, my car can be totaled, i might be a bit upset, but i hitch a ride home and i'm back to my normal life. it's much more difficult on a cruise ship because where are you going to go? >> reporter: notoriani is especial...

>> so you, your wife and child, a little baby -- >> yes. >> -- you go into the cafeteria. >> we go into the cafeteria. there was also another nurse who was pregnant, by the way, pushed my wife down there as well. she's a hero to me, her name is er erin. >> they had your wife in a wheelchair. >> yes. >> 90 minutes earlier she was delivering a baby. >> it was about an hour -- i'm sorry, about three, four hours right before is when everything took place. well, as we get down there, you know, the lights start flickering on and off. and they kept telling us, just kind of keep calm. we're on backup ...