Originally Posted by cherokeesam
In any event, Zola *definitely* survived, and we can suspect that he didn't remain a "guest" of the SSR forever. Maybe he escaped, or was involved in a spy swap during the Cold War. There's every reason to believe that Zola would have rebuilt HYDRA from the ground up, since he was more or less the brains behind the outfit anyway.
And Bucky would have just been waiting there, at the bottom of the valley, for years?