I was trying Plate 3, i raised the water up (the water is used as the texture for the ground) and made sure that people couldn't get sucked into the water, i copy and paste the interior that serves as the actual ground, and moved it far up so that if you fly towards the water, you'd just hit into the bottom the interior
However, that plan failed when i tried adjusting the interior to a certain height below the water, though it seemed mostly random, i would go through the bottom of the invisible interior instead of bumping into it, but when raised above the water, most of the time, i'd bump into it, i made sure the settings were applied and if relighting the scene did anything, but neither helped...