IDUN went - 40 meters underwater! We attached our electrodes to the skin of Italian pro apnea diver Antonio Mogavero on his free dive in the deepest pool in the world, the Y-40 The Deep Joy in Padova, Italy. For the first time in the world, beat-to-beat analysis, heart rate variability and early signs of decompression sickness can be measured even at 40 meters under water. The IDUN Dryode™ is able to reduce disrupting motion effects and to deliver a fantastic signal quality. "Measuring athletes at their performance limit”: this exciting project came true with the great support of Red Bull Media House, that gave us wings with their technical expertise and the production of this wonderful clip.