Marine experts are battling against the clock to re-float Cherie Blair after she was washed up on mudflats near Weston-Super-Mare in Somerset.
The prime minister's wife was enjoying a cruise around Britain on board the yacht of ventriloquist Keith Harris when she took a dip and was not seen for another 12 hours.
Coastguards believe she may have got into difficulty in the water before the tide beached her on the shore.
Weston's duty coastguard Captain Reynold Chapps said: 'The longer she stays out of the water the more we are concerned for her safety.
'Its is already getting very cold at night, but fortunately she has a thick layer of insulating blubber which helps to keep her warm.'
Mrs Blair has suffered a series of setbacks this year. In April she hung her knickers out to dry on the line in Downing Street and a family of gipsies moved in - with a horse.
Then in his autobiography 'One Show Tony' father Tony Booth revealed how he used to put the young Cherie on the mantlepiece to 'keep the other kids away from the fire' and frequently wrapped her packed lunch in a road map.