This is getting serous. We should put the Chinese in charge of security.
Probably the missing data is some Fortran code. Probably an intricate piece of software for solving some really ugly system of partial differential equations. I had a colleague some years ago who did research in the sort of thing. He wrote a Fortran program for his dissertation that modeled a melting nuclear reactor core. (His work was unclassified.) He said it took three years to get it to work.