214 to crash. those investigators have been using examples from previous crashes to help them. cas casey wyans show what they learned. reporter: several korean accident investigators got their training here, according to the aviation safety program. inside and old sears warehouse where the twisted wreckage of plane crashes serves as a classroom for accident investigators. what you see around here is a safety system that has failed. reporter: instructors took me through part of the training. what strikes me is there was a big fire here and it doesn t look like anyone could have survived this. reporter: what do you see on that left wing? i see twisted metal. it looks like some sort of significant trauma happened to that wing. crashed into something. hit something. i don t know. a pole. reporter: we teach the discipline of accident investigation namely to observe