Woman swept out to sea off Japanese beach is rescued 37 hours later -- and 50 miles offshore

Japan's coast guard reported that a woman who was swept out to sea while swimming was rescued 37 hours later, having drifted more than 50 miles in the Pacific Ocean.

A woman who was swept more than 50 miles out to sea while swimming at a Japanese beach has miraculously survived after spending 37 hours in the water, officials say. 

A cargo ship spotted the woman, identified only as a Chinese national in her 20s, drifting in a swimming ring early Wednesday off the southern tip of the Boso Peninsula, according to Japan’s Coast Guard. 

She vanished while swimming at Shirahama Ohama beach in Shimoda, about 125 miles southwest of Tokyo, the AFP reports. 

"It was around 7.55pm on July 8 when we received the information after the woman’s friend reported to a nearby convenience store that she was missing," a local Coast Guard official told the news agency. 

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The cargo ship that spotted the woman asked a passing LPG tanker, the Kakuwa Maru No. 8, to help. Two of its crew members jumped into the sea and rescued the woman, officials said. She was airlifted by a coast guard helicopter to land, they said. 

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The woman was slightly dehydrated but was in good health and walked away after being examined at a nearby hospital, the officials said. 

The coast guard said she had drifted more than 50 miles and was lucky to have survived despite the dangers of heat stroke under the sun, hypothermia at night or being hit by a ship in the dark. 

The Associated Press contributed to this report.