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 deepest open circuit SCUBA dive according to the Guinness Book of World Records was 318.25m. This dive was completed on the on the 3rd June, 2005 and took place at the Blue Hole, Dahab, Egypt by Nuno Gomes. The dive took 12 hours and 20 minutes to complete.