A CK-MB test may be used as a follow-up test to an elevated CK in order to determine whether the increase is due to heart damage or skeletal muscle damage.
Scuba organizations say recreational divers shouldn't go below about 130 feet, but one Egyptian diver recently ventured a bit deeper -- going more than 1,000 feet below the ocean surface and setting a world record in the process.
With standard scuba equipment you have a maximum depth of approximately 60m (195ft). This is because, after this depth the pressure exerted on the oxygen in your air supply becomes toxic, going further or experiencing this toxicity for too long could prove fatal.here are specialised pieces of scuba diving equipment that make it possible to overcome deep diving problems such as nitrogen narcosis, oxygen toxicity and the tremendous pressure you can face at extreme depths.