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.
The diver(s) exit the bell only long enough to perform what is (usually) a short work time. This type of diving is sometimes referred to as bell-bounce diving. Full saturation diving has been conducted to depths of nearly 2,000 feet. One classic saturation dive for a crew of eight divers was to 600 feet for 30 days.