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.
When they ascend and the lungs grow larger the fluid occupies only a small portion of the lungs preventing drowning. Incidentally, the free-diving record, held by a woman on 4/29/07, is 289'. On 12/13/10 William Trubridge did a free-dive to 330' (100 meters) in the Bahamas.