-- advantage. >> we learned there was a leak inside power paragone, a subsidiary of l-3 communications. most of their work is in electronics. the technology being leaks to china was navy destroyer information and submarine information. in the begin, we didn't know exactly who was the source of the leak at power paragone. we took a look at a number of factors. we look at travel. we look at access. after we sifted through all the information, it came down to one person. and it was chi mack. >> chi mack was born in china. he moved to the united states with his wife. he became an engineer in southern california in the 1980s.