but also trains and even ships. the reality is there are few countries in the world, just a handful, who have the technical know how to work out what's inside of these things and this lab is one of those places. boxes from other investigations, torn apart, burned, damaged if many ways suggest a tough assignment. here they say the story of what happened is usually found. >> a lot of our work is with undamaged recorders and easy to download them with a memory stick. >> even with damaged one your recovery is good. >> we have always been able to retrieve the data from the ones we have received. >> reporter: the job requires a lot of patience. >> we obtain a raw data file. >> just ones and zeros. >> contains just ones and zeros. >> reporter: the boxes contain a wealth of information, up to