During his escape the 18-year-old had triggered a signal alarm in the patrol station of Border Regiment 33 at 9 p.m. A sergeant of the East German border troops responsible for checking on the other border guards in the surveillance area was alerted.
He continued toward the anti-vehicle trench. Two border soldiers on a watchtower noticed him at around 3:45 p.m. They shot a flare and curtain fire. Bullets hit the ground in front of Willi Block, but he was undeterred and tried to crawl beneath the three rolls of barbed wire that separated him from West Berlin.
It was about 7:15 p.m. when the two boys were noticed by border soldiers that evening near the garden colony "Sorgenfrei." A report stated that the border guards "recognized as silhouettes two people who had passed the interior barrier." When they did not respond to the warning shots, the guards opened fire.
The only existing official document recording what happened that evening states that the injured victims "were retrieved and transported to the People’s Police Hospital by ambulance. One of the two border violators died from his injuries; the other one was interrogated in the People’s Police Hospital and said that he came from the Friedrichshain district."
They reached the wooded border grounds unnoticed and crawled under a signal fence near Steinstücken at around 6 a.m. Although they set off an alarm, the guards on duty did not react immediately. Eberhard M. shot one watchdog and choked another within the security strip.
Dieter K. managed to crawl under the interior fence but triggered an alarm soon after that. Flares suddenly shot into the air. Petrified, the men ducked into the grass. Dieter K. was already on the other side of the first fence, but Eberhard Schulz was still in front of it. Apparently he had lost his nerve and had not followed his friend through the fence.
Michael Kollender was only a few meters away from the border line and continued crawling forward. No less than 109 shots were fired by the border guards. They were not poor marksmen and could have hit him had they wanted to do so.
A total of 176 bullets were fired. They hit the West Berlin side, striking a window of the Reichstag building, a VW bug and an educational institution. Four bullets hit Paul Stretz in the back of the head, chest and upper arm.
He probably had had a few drinks to boost his courage before he entered the border area early in the evening at the closed-down S-Bahn tracks that once led from Mahlow to Lichtenrade. He came within 100 meters of the last three-tiered barbed wire fence unnoticed. Then suddenly, without any warning, the first shots were fired.
Two border guards noticed him near a former loading ramp. The fishermen had notified the West Berlin police and British military police and they had both arrived at the scene by then. When the East German border guards fired a warning shot, the West Berlin police called out: "Don’t shoot. He jumped in from our side and is a little drunk!"
September 13, 1966 was a hazy late summer day. That morning between 10 and 12 o’clock, six year-old Andreas Senk was pushed into the Spree by a playmate of the same age who, shocked by his own actions, ran away.
Karl-Heinz Kube prepared for the escape by acquiring two wire cutters from the Konsum department store in Potsdam. These were needed to cut through the wire obstacles. The two young men managed to get passed the first wall, the trip wires and a barbed-wire barrier, and to enter the 12-to-15-meter-wide death strip.