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.
while a less intensive kind of diving called cavern diving does not take divers beyond the reach of natural light and typically no deeper than 100 ft and penetration not further than 200 ft true cave diving can involve penetrations of many thousands of feet well beyond the reach of sunlight