A family stranded by Hurricane Maria in Puerto Rico issued a low-tech distress call — painting “HELP” on the roof of their crumbling home to attract rescuers.

Footage emerged of the crew of a US Customs and Border Protection chopper hovering above the site after spotting the bold letters Sunday.

Rescuers from the Black Hawk are then seen trekking along a road that had been swept away by a landslide — stepping over fallen trees and underbrush on their way to the three residents.

The Category 4 storm slammed into the US territory Sept. 20, killing at least 16 people, inflicting catastrophic damage and leaving nearly all of the 3.4 million people without power, and most without water.