Something strange is happening underneath Area 51. According to United States Geological Survey data earlier this week, over 100 people have reported at least 17 earthquakes within the span of only 24 hours not far from the infamous, highly classified military base. The comparatively shallow events about 2.5 miles below the ground ranged between 2.5 and 4.4 in magnitude, with the strongest reportedly recorded in “an unusual place to get an earthquake,” according to geophysicist Stefan Burns.

Conspiracy theories are already spreading online about aliens, UFOs, and other spooky phenomena, but one hypothesis at least initially sounds more plausible and unnerving. Based on the region’s past along with recent domestic policy reversals, there is technically a not-zero chance that the U.S. re-started underground nuclear tests. That said, don’t go racing to the underground bunkers just yet. (1)

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“It’s almost certainly not nukes lol,” Martin Pfeiffer, a semiotic anthropologist and nuclear weapons researcher, wrote to Popular Science. “Nukes have a relatively distinctive seismic signal.” He added the nuclear option is also unlikely because the U.S. typically detonated underground nukes at very shallow depths.

So, while certainly dramatic, the odds that the U.S. suddenly detonated over a dozen nuclear devices underground near Area 51 this week are extremely low. That said, the jury that means the still out on the extraterrestrial theory…