What is the recommended waiting period for scuba divers who dive below 8000 ft and do not require controlled ascent?

The recommended waiting period for scuba divers who dive below 8,000 feet and do not require controlled ascent is 12 hours. This recommendation is based on the need for the body to eliminate nitrogen absorbed during the dive and to avoid decompression sickness, also known as "the bends".

When scuba divers ascend from a dive, nitrogen that has been absorbed into their bloodstream needs time to be released safely. The 12-hour waiting period after such dives is considered a conservative approach to ensure that divers have adequately off-gassed. This time frame takes into account various factors such as the depth and duration of the dive, as well as individual physiological differences among divers. It is important that divers adhere to this waiting period to ensure their safety and well-being prior to flying or engaging in other activities that might stress the body.