French sailor survives 16 hours in capsized boat in Atlantic
The 12-metre vessel, which had set sail from Portugal's capital Lisbon, sent out a distress signal late on Monday evening from the Atlantic Ocean.
Spanish coastguards found the upturned boat, but the sea was too rough to rescue him - so the sailor had to wait until morning.
The man's survival was "verging on the impossible", said coastguard divers.
His boat sent a distress signal at 20:23 local time on Monday, 14 miles (22.5 km) from the Sisargas Islands, near Spain's north-west Galicia region.
A rescue ship carrying five divers as well as three helicopters set off to find and rescue the man, who has not yet been named.
A diver was winched onto the ship's hull to seek signs of life and the man responded by banging from inside.
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