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.
âThe Man Who Doesnât Breatheâ: World-record diver can hold his breath underwater for 22 MINUTES. 1  Stig Severinsen is the holder of multiple records in diving using his 'State of Zen' technique to control his breathing.  Also swam 500ft underwater in 2mins and 11secs.