20 November 1963 – 21 November 1963 · Swimming
Hubert Hohlbein – under the Jungfernsee in a diving suit
Wearing a diving suit and weight belt, 21-year-old Hubert Hohlbein swam submerged from near Cecilienhof Palace in Potsdam to the West Berlin shore by the Glienicker Brücke.

Hubert Hohlbein, 21, had secretly practised in Berlin's waters with friends; two of them had already escaped by the same route.
In the night of 20 to 21 November 1963 he entered the Jungfernsee near the disused Meierei restaurant close to Cecilienhof Palace in Potsdam. Wearing a diving suit and a weight belt to stay low in the water, he swam as quietly as possible through the cold border water.

After about an hour and a half he came ashore unharmed near the Glienicker Brücke in Berlin-Wannsee.
In West Berlin he studied electrical engineering and later joined the helpers of the October 1964 tunnel through which 57 people escaped — among them his own mother.
Sources
- Gelungene Flucht durch Potsdamer Grenzgewässer, 21. November 1963Chronik der Mauer
- Flucht aus der DDR: Durchs WasserDemokratiegeschichten
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Related escapes
8 October 1986
A landscape architect dives through the Jungfernsee barrier
A 29-year-old landscape architect in a diving suit slipped through a corroded gap in the underwater barrier at Nedlitz and swam to West Berlin north of the Glienicker Brücke.

4 November 1963
Klaus Schröter – homemade diving suit at the Reichstag
Engineer Klaus Schröter sold his television to build a weighted diving suit and tried to dive through the Spree to the Reichstag bank; guards shot him and he drowned.

19 November 1962
Horst Plischke – missing in the Havel for four months
A 23-year-old from Potsdam went into the Havel north of the Glienicke Bridge before dawn; guards spotted him and fired, and he drowned. His body surfaced four months later.
1 January 1963
Hans Räwel – New Year's morning in the icy Spree
After a New Year's Eve party, 21-year-old baker Hans Räwel swam into the freezing Spree and was shot at close range from a border boat about 35 metres from the western bank.
