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.
Hi Tommy, As far as recreational diving goes, the maximum limit from PADI (a top certification agency) is 130 feet once you pass your deep diving course. If you have an open water certification, you are certified for dives down to 60 feet.