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.
During the winter, otters can breathe in the space between the bottom of the ice and the lowering water. Did you know that otters can dive deeper than 50 feet underwater? Otters can dive as far down as 55 feet! They can also swim a 1/4 mile with only 1 breath and can stay underwater for 2 minutes.