Why do you think North sea guys get immersion suits...nothing to do with ditching, more to do with machines that leak like a sieve. Super Puma's do not like being shut down off shore in the rain, i have had a couple of experiences when having shut down over night, after a heavy shower or worse a sea fog with a bit of wind behind, moisture has got into the aircraft and next morning, press the button and nothing....not even a click. you would think that a multi million pound helicopter would at least be able to keep a bit of rain out.
T4