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Working at 100-foot depth, you'll have decompression chambers. >> reporter: a potentially slow process because divers can only remain at those depths for short period. does i understand needs yeah have the know-how on how to pull off a recovery effort like this. >> seems like a fairly small body of water. but when you're out there, it's huge. >> usually you're extremely careful not to say you found something. >> reporter: woods hold participated in the recovery that took two years to recover, footnoting what a painstaking process this can be. on the other hand this airasia crash occurred in mu...

>> what you want to do first is to really map the entire accident scene. >> reporter: we spoke with peter goelz, a former investigator with ntsb who worked on the recovery and rebuilding of twa flight 800 that crashed after takeoff from new york city. >> you document everything until you really get the information off the data recorder and the voice recorder. >> reporter: he says the site needs to be treated like a crime scene and mapping the debris field before removing objects can be key to finding out what happened. then comes the process of pulling up the giant pieces of debris from the bo...

>> first they have to map all the pieces. that of course could be an enormous job, just finding out where all the pieces of the plane might be scattered under water. after that it's sort of lifting one piece out by crane and with the help of divers and they try to get it all assembled at least until they find the voice recorders, and that might help them know a little bit more about what happened here. and then they would have the opportunity to take select pieces out as they try to reconstruct the plane to show exactly what happened. it's very complex process. as you know using divers at that...

The bottom of the ocean. >> what you want to do first is map the entire accident scene. >> we spoke with former investigator with ntsb who worked on recovery and rebuilding of twa flight 800 that crashed after takeoff from new york city. >> you document everything until you really get the information off the data recorder and voice recorder. >> he said the site needs to be treated like a crime scene. mapping the debris field before removing objects could be key to finding out what happened. then comes the process of pulling up giant pieces of debris from the bottom of the sea. >> you have a nu...

>> 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...