 In 2012, Nitsch returned to the "No Limits" category in the waters off Santorini, Greece, with a project labeled "Extreme 800", aiming for a depth of .Following extensive training using an innovative torpedo-type sled design of very high descend and ascend speed, on June 6 Nitsch managed to reach a depth of , but ten minutes after the dive he began experiencing serious symptoms of decompression sickness.Nitsch temporarily fell asleep due to nitrogen narcosis during the last part of the ascent (as opposed to through oxygen starvation), and woke up prior to reaching the surface.