Crushing, yes, or even a ripping open (contrary wise) and
an unpleasant shock resulting in almost complete cessation of all bodily and mental functioning for a clear second... |
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I'd agree with this too, except it is (or seems to be) for much, much longer than a second. It is raw and primeval, not exactly painful as such but much more elemental, like birth perhaps, or death. Your brain's 'flight or fight' reflex takes over with such an overwhelming force that it is quite disorientating.
Then a electric shock jolt, your heart re-starts and you tell yourself to
breathe and calm down...
And then you go under
<Added>I should say I'm talking about the effects of proper cold water here, 10 degrees celcius or less.
PS - no wonder folk die by falling into reservoirs and such...