Residents in Nevada have been scared after hearing thunderous and disturbing sounds echoing through the canyons around Lake Mead.
Dozens of reports have flooded in to local police near the Redstone Picnic Area, a popular spot for camping.
This area sits in the desert of Nevada, just a short 30-mile drive from Las Vegas and next to the iconic Hoover Dam.
However, the peace was broken by rumbling booms that sounded like a giant metal door groaning in the distance.
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