And then they had different sand traps so they could check footprints in the morning if somebody got through. They had Stalin's carpet, which were nails pointing up. They had over 100 watchtowers. They had bunkers with thousands of Germans. They had tripwire machine guns. They didn't want people leaving. So that wall stood from 1961 to 1989, and people still tried to leave, even with the shoot to kill orders.