Diana Nyad made it farther than she ever has in her previous three attempts to swim from Cuba to Florida, but, like those other three tries, this one has come to a premature end.
Early Tuesday morning Nyad and her team decided to call off her attempt to become the first person to swim the Florida Straits without a shark cage -- a day before her 63rd birthday -- due to storms, jellyfish stings and the threat of sharks.
"We pulled her out of the water," Steve Munatones, the swim's official observer, told "Good Morning America." "The dangers were so great that we couldn't risk anyone's life, including her own."
According to a post on the swimmer's blog by one of her crew members, Monday night was especially rough for Nyad, who was attempting to outlast a second storm, fight off hypothermia and endure nine jellyfish stings that night alone before being pulled from the water at 12:55 a.m.