The water probably isn't as cold as you think it might be, and certainly less cold than the air temperature outside of the sea at this time of year.
Isn't the point that it's still a long way below 37 degrees C and much more effective than air at conducting your body heat away?
Yeah, I was making the point that it'd still kill quickly.
Re-reading it, TBF you did point that out, just wasn’t that clear to me.
@kl started
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Isn't the point that it's still a long way below 37 degrees C and much more effective than air at conducting your body heat away?