Nietsch puts some kind of liquid in his ear before diving. Maybe vineager? Oil?.
Things he has been heard saying:
"I like freefalling into the abyss"
"I am not scared, but I have some respect"
"You need a strong mind, be determined and think about what you do"
"I use a lot of weights. I don´t like to swim down. I like to concentrate on my equalization" (he uses 3 kg)
"I use competitions to try my limits"
"It´s an instincts - you will make it to the surface - maybe clean - maybe not"
"Pack till you explode"