Or several, well placed, holes in the ice.
Still need to be whalesque, really cold water and being physically active, and you’ve got targets to meet while your down there, not you stees, you’d be fine, 😊
But I could see it being adapted, to say an Olympian size pool, I think their on to something here.
Relating to another thread, if your sitting at the side of an Olympic size pool with a cover displaying holes at regular intervals and someone says “what do you think of the hockey” you can assume their referring to this hockey. But I still think it’s more of a spectators sport 😟