David Vencl: Free-diver plunges to record depth beneath frozen Swiss lake | CNN

He kind of enjoyed it but he admits he was a little more nervous than usual and he had some problems with breathing, he told Reuters.

There is nothing difficult for him to be in cold water& Lack of oxygen is something normal for him. But this was completely different because it s really difficult to work with the pressure in your ears in cold water, he added.

If you combine all these three things: cold water, lack of oxygen and the problem with working with pressure, it s something very unique, he added.

via www.cnn.com

Sounds very cold.