I dont know if this is the right place to put it so mods and co, please take it where ever it needs to be.
A couple years back I went to a waterpark in greece called aqualand, the wavepool, Im guessing, by the wooshing sounds at the back it was air system, computer sequence controlled. youknow, the old style, not the toilet flush system
anyway there was no rope from the back wall, but you HAD to be in a rubber ring thingie if you went near the back, is it possible you could get sucked in through the bars? when the machine isn't on they let you just wonder around and the 8 or 10 holes are actually quite shallow, I always find those big holes scary. going by physics, because water has to squeeze out the air chamber, that then means a lot of water goes back in right? I was tempted to see if there was any suckage but I was prety apprehensive about getting out my ring to find out!
In smaller wavepools in the uk, I remember as a kid feeling a bit of suction. With the bigger ones, would what happen if it sucked you through the bars/grate, would you just hit your head on the top the the blowers are? I find the whole thing really scary bacase you can't see what'a behind the wall.
After looking around on google, there's no reports of injuries of deaths.