Spy organizations have agents who collect intelligence for them. Ideally, the foreign power you are spying on will not know the identity of your spies. To them, your spy in the nuclear facility will just be an ordinary worker.
A “double agent” can happen when the foreign power *does* know about the spy and gets them to “switch sides.” They might convince or coerce your spy in the nuclear facility to send you false information about the operation of that facility or to give them information about how your own intelligence agency.
Turn this around again, and you have a “triple agent” – someone the foreign power *thinks* is a double agent but is still collecting accurate intelligence for you, perhaps even about the foreign intelligence agency.
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