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Um.. Maybe I'm getting picky and off the point here but, I still disagree.

> OK, gravity exists underwater. The point
> is that blood doesn't weigh anything in water,
> thus no gravitational pull. The pooling of

Blood still has the same mass and (due to this hypothesis still being in
Earth's gravitational pull) therefore still weighs the same.

> blood in lower body is canceled once you're
> immersed. Whether you stand upright, inverted --

Depending on depth. Read on.

> whatever, blood does not tend to sag to the

I disagree, depending on depth.

> lowest point. This is why head-down underwater
> doesn't give a red face as it would on land.

Depending on depth.
 
> 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.

All tension is lost since the weight of the water exerts a greater pressure
on THE BAG than is the case in air, the weight of the water within remains
the same, and the gravitational pull of the water (in and outside of the
bag) remains the same.

The water exerts pressure on a diver (much the same as your bag) in a
similar fashion to that of a G-Suit in a jet-pilot, and as with a G-Suit
the water pressure will ATTEMPT to force the blood to the highest
extremity, pooling will STILL exist, but, how much pooling will take place
will depend on the depth diver is at.

If you attempt the example of a head down diver at 2-3m I can assure that
although, reduced, you will feel the effects of pooling, at depth however
the feeling will be greatly reduced.

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