People came from miles around to take part in this exciting event.
The temperature of the North Sea at the Grand Beach at Ostend had risen to 9° Celsius (48° F)on Saturday.
Greg Broekmans, who organises the event, says that in the past often temperatures of only 2 (35° F) or 3 degrees Celsius were recorded.
A record 10,000 people had turned up to cheer on the 'ice bears' who followed the signal to run for the water at 15:00 CET exactly.
Everything went according to plan and no incidents were reported. Though some ice bears didn't spend longer in the seawater than necessary, everybody got a beaker of soup and some Dutch vodka when they had accomplished their feat.