probably in this case the simplist solution is the most probable... you've hit a whale.....

IT WAS IN THE NORTH ATLANTIC IN A MILITARY FLIGHT FROM FRANKFURT GERMANY TO
PHILADELPHIA WE WERE AT A HIGH ALTITUDE AND WITNESSED LARGE OBJECTS IN WATER
A SCHOOL LIKE FORMATION SIMILIAR TO WHALES THE ONLY INTERESTING THING ABOUT
THIS WHEN NOTICED WAS THEY WERE VISIBLE AT A HEIGHT OF OVER 15,000 FT. THE
PILOT CAME OVER THE SPEAKER SAYING THEY WERE WHALES IVE SEEN WHALES FROM THE
AIR BEFORE AND THESE WERE NO WHALES FOR ONE WHALES DONT SWIM WITH HALF THERE BODIES OUT OF THE OCEAN FOR SEVERALLY LONG PERIODS OF TIME ALSO WHALES AREN'T
SNAKE LIKE SHAPED. I COULD BE WRONG BUT IF SO I'VE NEVER NOTICED ANYTHING
LIKE THAT BEFORE. - BCM2568@aol.com