Joshua Demarest died but his friend Tyler Day was found alive after being submerged for hours in New York.
A snow plough might have triggered the collapse as it dumped cleared snow on top of the mound, and Tyler told police he heard bleeps before “it went black”.
Seven tones of snow were removed in the hours-long rescue in the upstate town of Greenwich.
Investigators were first called by Tyler Day’s sister after he had not returned home by 17:00 local time.
Police, assisted by search dogs, followed the boys’ tracks from their home and found their sled beside the mound of snow.
Greenwich Police Chief George Bell said at a news conference: “I bet they moved seven tones of snow easily out of that pile by hand, shovels and snow rakes.”
Joshua Demarest was found by rescuers, but he was unresponsive and rushed to hospital, where he was declared dead at 22:00 local time. An hour later, the second boy was found alive in a pocket of air.
Chief George Bell said: “You can actually see the little pocket in that huge bank that he survived in and it is nothing short of a miracle.”
It was “a true accident,” he added.
“That’s all I can tell you. A tragedy all the way around. There was no way that anybody could have seen the kids burrowed in back there.”
Department of Public Works Superintendent Leo Flynn says it would have been impossible for his workers to have seen the teens beneath the snow.
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