I'd imagine that jumping so far into such cold water, even if your form is perfect, would also be quite shocking to your system and probably dangerous in and of

I'd imagine that jumping so far into such cold water, even if your form is perfect, would also be quite shocking to your system and probably dangerous in and of itself. I say this as someone who went swimming with penguins in Antarctica this January. No way I would enter that cold water so deeply and quickly.