We had to wear the gloves and hoods that we would normally wear here while doing it (5mm and 7mm respectively for me)
... man does that suit lose air fast when you do the neck seal
I tested mine in a pool, i cant dump through the neck seal. Combination of thick tight hood and thick gloves mean i cant get access to it. Not that it bothers me.
Water in your suit does not weigh anything in the water, it's the loss of lift that comes with a massive suit flood like zipper failure that is a problem, especially if it happens at the beginnig of a dive with full tank(s)
The issue isnt loss of lift - its loss of insulation. If you've got a long time left in the water that can be serious.