Imagine what it would be like if you are walking on a tight rope.
Now picture yourself in that you are walking on a thin wall , almost as thin as this 'tight rope'.
And picture yourself walking on that wall , almost losing your balance in either direction if you stop at any time.
On either side of the wall is water in a long string of swimming pools , many ,many yards long ,all rectangular in shape, and the only way is forward.
And in all the swimming pools are a single large roaring /rotating vortex( whirlpools) and you are desperately trying to maintain this ' balance' to avoid falling in and drowning.
Scary dream
My mother , when about 15, was swimming alone in an industrial lake, and was almost overtaken by one of these.
She could hear the 'roar of it',but couldn't see it of course due to being at about eye level with the surface .
She was at the extremity of it ,and could feel the' tug' ,and then she panicked and just swam her heart out.
Don't know the origin of this whirlpool, but it was obviously water drawn in from the bottom for the nearby 'plants'.
Crazy