More than a dozen earthquakes have struck near Nevada’s highly classified base in the past 24 hours.

At least 17 earthquakes up to a 4.4 magnitude were detected just miles from Area 51, a cultural phenomenon thanks to decades of conspiracy theories connecting the base to UFOs, aliens and experimental aircraft testing.

The 4.4-magnitude earthquake kicked off the seismic activity, striking just 2.5 miles underground, fueling speculation about possible underground testing.

Read more: Unusual earthquake swarm strikes near Area 51 sparking fears of secret testing