The two big differences are; you have to clear faster in the water and you have to do it upside down. If you clear early and often you probably won't notice any difference until your lungs are collapsed to residual at about 30 meters (100'). To go deeper, you'll have to learn to draw air from the lungs to the mouth or better yet to fill your mouth with air before your lungs empty. If you use this air to equalize your mask then you'll be able to clear the same way to about 60.
Aloha
Bill
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careful about stepping on toes today
they may be attached to the a** you have to kiss tomorrow
Aloha Bill
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