For months, hype has been building to this day: the moment when thousands of people are apparently going to storm Area 51 to see what is lurking behind the barbed wire fences.
A Facebook event was posted in July and went absolutely viral, with loads of people around the world pledging to rock up to Nevada today.
The event description read: "We will all meet up at the Area 51 Alien Center tourist attraction and coordinate our entry. If we naruto run, we can move faster than their bullets. Let's see them aliens."
The event has since been deleted from Facebook and it was then turned into a music festival that went through some planning issues.
But for anyone who thinking of rocking up just for the lols, beware that the US Air Force has been really clear about the matter.
US Air Force spokesperson Laura McAndrews told The Independent: "[Area 51] is an open training range for the US Air Force, and we would discourage anyone from trying to come into the area where we train American armed forces.
"The US Air Force always stands ready to protect America and its assets."
Essentially, they're promising to arrest anyone who tries to get close enough and they're prepared to use force if necessary.
But if you're still thinking of seeing just how far the Air Force will go, look no further YouTuber Ties Granzier and his friend who were recently arrested for getting too close.
Ties Granzier, 20, and Govert Charles Wilhelmus Jacob Sweep, 21, were found around three miles inside the Nevada National Security Site, according to Nye County Sheriff's Office.
Officers said the Dutchmen understood the 'no trespassing' signs they passed and found a number of recording devices in their vehicle.
If you think that's bad, someone was shot and killed for getting too close in January.
A press release from the NNSS explained that a man had refused to stop at the security gate and drove around eight miles while in pursuit.
When he eventually stopped, he approached security officials with a 'cylindrical object' in his hand.
Officials in charge of the remote county in Nevada home to the Area 51 military base have declared an emergency ahead of today's event.
County Commission Chairman Varlin Higbee told the Las Vegas Review-Journal: "Oh, we're taking this seriously.
"With the possibility of 35,000 to 40,000 people showing up, yeah, this is serious."
Serious, in this case, means that the infrastructure of the area - stuff like mobile phone coverage, campsites, gas stations - is going to be stretched well beyond capacity.
It'll be interesting to see if anyone actually turns up.