Pinkbike has published the video and compiled the details: The whole thing happened around 100 kilometers from Prague on a frozen pond in a sand pit. The two EWS U21 riders Max Adami and Vojtěch Bláha rode ahead, their buddy Jiří Fikejz rode behind with a running GoPro. He later reported that other people were skating on the ice. If steel curves don't collapse, the ice should also be able to withstand the pressure of gravel tires, one would think. But that was not the case. The first thing to break was the rear wheel of one of the three riders, seconds later he was completely covered in ice. The filmer rushed to his aid and also collapsed. The video is quite unclear for understandable reasons, but according to Jiří, all three were eventually in the water. One of them still had the nerve to dive for his bike. They then cycled home for half an hour in -7° temperatures. The gears froze instantly and their clothes did the same on the way home. There, one of them first had to unfreeze the buckles of his shoes before he could take them off.

And what do we learn from this? Never walk on ice that is not officially cleared. The ice is thickest on the shore because the water cools faster there. This is why stagnant bodies of water freeze from the shore inwards and are thinnest in the middle. Incidentally, particular caution is required in reservoirs (storage lakes) because the ice may not be lying on the water but "hanging in the air" and therefore break even more easily.

The whole story on Pinkbike