Sonny Boiser is your typical 15-year-old who wanted to kick back in the evening and swim at a swimming hole near the Blue Hole hiking trail in Kauai.

The trail is located along the second rainiest spot on Earth, so there is always  plenty of fresh water in the hole to swim.

That’s when Sonny suddenly heard cries for help.

He walked from the trailhead where he parked his car to find 20 hikers stranded on the other side of a stream flooded with raging water.  The stream, which earlier in the day had been so dry the hikers could walk across it, filled after a light rain turned into a downpour.

“We couldn’t cross the river even if we tried to,” Micah Phillips-Lam told the Garden Island newspaper. “When we got there, my friend Will, he tried to swim across and he almost got swept away, so we didn’t try again. It was raining and we were all cold, the whole group of us, and we just waited. We didn’t know what to do, honestly.”

“There was this brown rushing water and giant logs going downstream,” Phillips-Lam added. “We didn’t want to take our chances.”

Boiser took a rope that one of the hikers carried and tied it to the back of his truck as the hikers secured another end to a tree.  Boiser then kept pulling the truck forward to keep the rope taut for the hikers to use to cross.

“It was a crazy experience. We got so lucky,” Phillips-Lam said. “[Boiser is] a really cool kid.”

“I was glad I got there and they didn’t have to spend the night there,” said Boiser, who has his learner’s permit and was driving with his older sister.