reporter: he says the site needs to be treated like a crime scene and mapping the debris field before removing objects could be key to finding out what happened. then comes the process of pulling up the giant pieces of debris from the bottom of the sea. you would have a number of lifting cranes and you would have teams of divers and the divers of course even working at 100-foot depth you ll have to have decompression chambers. i a potentially slow process. divers can only remain at depth for short periods due to health concerns. does indonesia have the expertise to carry it off? david galo with woods hole oceanographic. usually you re extremely careful not to say you ve found something until you it. reporter: he helped in the
begins. how do you pull a plane up from the bottom of the ocean? what you want to do first is to really map the entire accident scene. reporter: we spoke with peter gels former investigator with the ntsb who work read the recovery and rebuilding of twa flight 800 that crashed after takeoff in new york city. you document everything until you really get the information off the data recorder and the voice recorder. he says the site needs to be treated like a cream scene and mapping the debris field before removing objects could be key to finding out what happened. then comes the process of pulling up the giant pieces of debris from the bottom of the sea. you would have a number of of lifting cranes and you would have teams of divers and the divers of course even working at 100-foot depth you ll have to have decompression chambers. a potentially slow process because divers can only remain