After relieving the cramp, rest the muscle for a few minutes before continuing at a slower pace - with about 50 to 75 percent of the load you had on the muscle before. A cramped muscle usually recovers better if you resume using it at a reduced pace after a brief rest than if' you stop using it completely.

Sometimes divers become so tired and out of breath they can't swim to the boat or shore. Or, they may have severe leg cramps that prohibit swimming, you can assist such a diver by establishing positive buoyancy and having the diver do the same, that helping the diver to the boat or shore using one of several tows, such as the tank value tow or the tired diver push, sometimes called the modified tired swimmer carry. Your instructor will demonstrate these and let you practice them

During your first two confined water dives, you learned how to use an alternate air source, and you learned what it feels like to run out of air. Now you're going to put these together to practice responding to running out of air. Your instructor will turn off your air like when you did the air depletion exercise. 

Don't look at your SPG - but as soon as you feel breathing resistance, signal "out of air" and "share air" to your buddy. Secure and start breathing from your buddy's alternate; after you take a moment to get situated and make contact with each other, your instructor will have you swim together for at least one minute while you continue to use the alternate. This simulates swimming to the surface from 18 metres/60 feet deep.

As soon as you secure your buddy's alternate and remove your regulator from your mouth, your instructor will turn your air back on. That way, if you need to you can . Itch back to it. Confirm that the valve is open by checkin,,,Your SPG, which should not be on (or near) zero if it is.