Illustration of experiencing the principle of dry immersion enabling the study of weightlessness pathologies. The subject is placed in a tank of water, wrapped in a tarpaulin simulating the effects of weightlessness on the sensorimotor and cardiovascular systems. Under the effect of microgravity, the spinal column lengthens (in the left close-up, a spine in microgravity and on the right, a spine in earth抯 gravity.) Microgravity leads to the following pathologies: -cardiovascular problems -bone loss -muscle tone loss