that held alan gross. this maximum prison outside of havana. he had long been identified publicly as a political prisoner in cuba. >> well it was part of a three-member cia operation. and in the mid '90s something went wrong with the cia mission and one of the members was -- came under the attention of cuban counter intelligence. they tried to do an emergency ex filtration of all three members and for reasons i do not know, he was unable to get out of the country and was arrested. >> reporter: as part of the trade for gross and trujillo, three of the five were returned last night. they can only disclose pieces of the u.s. spy and he gave critical information and paid for it with two decades of