On March 14, 1974, Roberta Lincoln and Gary Seven conducted a mission on the Eastern side of the wall and were chased along toward the wall by East German soldiers. During the chase Corporal Erich Kilheffer thought that they might be heading towards Checkpoint Charlie, a border crossing, but the pair disappeared before then.
On November 9, 1989, Roberta Lincoln was watching the fall of the Berlin Wall on CNN when Khan Noonien Singh broke into the apartment and destroyed the Beta 5 computer. As the wall fell on television people were shown in the streets partying and celebrating while other started tearing down the wall. (TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 1)