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OK, gravity exists underwater. The point
is that blood doesn't weigh anything in water,
thus no gravitational pull. The pooling of
blood in lower body is canceled once you're
immersed. Whether you stand upright, inverted --
whatever, blood does not tend to sag to the
lowest point. This is why head-down underwater
doesn't give a red face as it would on land.

Think of it this way: put some water in a
plastic bag. It all stays on the bottom,
stretching the bag. Then throw this bag into
your bathtub. All tension is lost since the
water on the outside carries the weight of the
water within.
--
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