Authorities say two 15-year-old Rhode Island boys have spent the night outside in below-zero temperatures after they got lost while snowmobiling in Maine.

The Maine Warden Service said Ty Howard-Gotto and Jonah May were found unharmed Tuesday morning after staying in a small shelter.

Wardens say they got lost after leaving the town of Mexico at 7:30 p.m. Monday for their grandfather's camp in nearby Andover — then their snowmobile became stuck.

The temperature dipped to 9 degrees below zero — and the wind chill made it feel like 25 below. Hours later, they were found by a passer-by, who brought them to their grandfather.

It wasn't immediately clear how many hours the boys spent outside.