DzL Wow, that's brilliant. I've not yet mastered the fling, but it seems like that's a perfect use for it. I've managed to win the odd game from the submarine's tail just by holding on even when I'm deep underwater, but I had no idea you could fling yourself back.
Actually, speaking of holding on while underwater ... I feel very dirty for saying this because it almost feels like I'm cheating when I do it, but you can actually win while being underwater. A couple of times I've held on to the yellow bar at the front of the conning tower and let myself get taken under. Providing you time it right and have enough stamina when you go under, you can actually win this way, as spectators will then focus on everyone else who's climbing up the poles. They all get knocked off while you're semi-safe underwater.
Maybe it's just me, but I feel guilty when doing this. The game allows it, but it feels a bit wrong in my head. But, having said that, I've noticed more and more people are starting to figure this one out and are doing it themselves, so worth keeping a look out for it.
It's also worth noting that if you spot someone doing this, if you're a spectator, it's still possible to hit them with a fish even if they're underwater, so they're not completely safe - providing you do it before they get too deep. A bomb would probably work well here for lower depths, although I've not tried that.
