BERLIN (AP) — Three Swiss engineers accused of participating in a global nuclear smuggling ring are set to avoid further prison time, in part because they helped the CIA bust the network that was supplying Libya’s atomic weapons program.

Prosecution documents released Tuesday outline a plea bargain agreement under which Urs Tinner, 46, his brother Marco, 43, and their 74-year-old father, Friedrich, would accept the charges against them in return for prison terms that are shorter than the time they have already spent in investigative custody.