was any escape method used here?
Yes - by foot, hot-air balloon, swimming across the Baltic Sea
Inner German border
Escapees used a variety of methods. The great majority crossed on foot, though some took more unusual routes. One of the most spectacular was the balloon escape in September 1979 of eight people from two families in a home-made hot-air balloon. Their flight involved an ascent to more than before landing near the West German town of Naila. The incident inspired the film "Night Crossing".

Other escapees relied more on physical strength and endurance. An escapee on August 26, 1987 used meat hooks to scale the fences, while in 1971 a doctor swam across the Baltic Sea from Rostock almost to the Danish island of Lolland, before he was picked up by a West German yacht. Another escapee used an air mattress to escape across the Baltic on September 2, 1987.
what is inner german border? It was a border between the German Democratic Republic (East Germany) and the Federal Republic of Germany (West Germany) from 1949 to 1990.
wiki:17881560
Inner German border [SEP] Escape methods
Escapees used a variety of methods. The great majority crossed on foot, though some took more unusual routes. One of the most spectacular was the balloon escape in September 1979 of eight people from two families in a home-made hot-air balloon. Their flight involved an ascent to more than before landing near the West German town of Naila. The incident inspired the film "Night Crossing". Other escapees relied more on physical strength and endurance. An escapee on August 26, 1987 used meat hooks to scale the fences, while in 1971 a doctor swam across the Baltic Sea from Rostock almost to the Danish island of Lolland, before he was picked up by a West German yacht.