What happens if you don’t decompress when scuba diving is you could end up with decompression sickness or the bends. Most recreational diving limits scuba divers to diving depths of 40 metres (131 feet) and ‘No decompression stop diving’. This is to prevent your body from taking on so much nitrogen that it can’t off-gas enough during a direct ascent to the surface. Advanced divers dive beyond the no decompression stop dive limits. This means on their ascent from a dive they are required to stop to allow additional time to decompress. Each decompression stop allows time for gas to move out of the tissues and back to the lungs.