Investigators are trying to learn more about a bizarre incident off the coast of Rhode Island. A woman said she fell off a sailboat and her husband didn’t know she had been overboard for hours in Narragansett Bay. The U.S. Coast Guard says the woman said she fell off her husband’s 39-foot sailboat sometime Friday afternoon as they were sailing from Newport to East Greenwich.

The woman, who authorities haven’t identified, was found on Prudence Island at around 4 a.m. Saturday by a passing boater who heard her cries for help. The Providence Journal reports the woman had mild hypothermia but refused treatment. Her husband was found around 2 a.m. in Warwick after he ran his sailboat aground. The man told local police he thought his wife was below deck sleeping and didn’t realize she was missing.