[Dehydration--a risk factor for the decompression-accident in diving].

We report on a decompression-accident with neurological manifestation in an experienced recreational diver. As no obvious omission against the prescribed rules of decompression could be observed, dehydration due to intense jogging prior to the dive was identified as a risk-factor. Hyperbaric treatment resulted in a complete restitution. The physiological aspects are discussed and recommendations for the fluid-intake before diving are given.