Seven Days in a Romanian Salt-Mine "City": How MrBeast's Underground Challenge Grew from a Quiet Camp into Pure Chaos

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Overview

MrBeast and his longtime crew set out to spend seven days living inside a vast underground complex built in an old mine. He describes it as more than a thousand years old and full of uncharted tunnels and chambers. The video asks how such a place can exist at all. Underneath that question sits a hidden twist: every morning a new famous creator would arrive, and the narrator warns that the more YouTubers joined, "the deeper this city would fall into chaos." The group's exploration of the mine runs alongside a growing social experiment, as the population rises, alliances form, pranks escalate, and the group briefly attempts self-government.

13 min read
0:02

Descending 400 Feet into the Mine

The group enters by a long staircase that one member jokes is "older than us." At the bottom, they are struck by how high the cavern ceiling is. MrBeast says they are 400 feet underground and that "somehow this village just exists." He also gives a brief piece of history: during World War II, when Romania was being bombed, thousands of people sheltered in the mine. He contrasts that with the present, where "just a bunch of YouTubers live here."

The crew picks a spot for home base on the cavern floor. Their bags are still far above, so they work out a way to bring them down that ends with the gear landing in water and being fished back out. Their food for the challenge is bagged food, and each person brought one personal bag. Even after setting up camp, MrBeast points out that they have barely seen the city. The surrounding walls hide many tunnels, and he says there is a second chamber as large as the one they are in. Off camera, he reveals the twist to viewers: a famous YouTuber will join each day to help explore. He sends everyone to bed early because of a "big surprise in the morning," and day one ends without incident.

1:54

Day Two: JiDion and the "Access Forbidden" Tunnels

The next morning, MrBeast gathers everyone at the elevator and announces that a famous YouTuber will now arrive every morning. The first guest is JiDion. JiDion is immediately impressed and calls it "legit a city," pointing out that it even has a Ferris wheel.

The group's first push into new territory goes up a staircase they hadn't climbed yet. MrBeast calls it the most ominous stairs anyone has ever seen. The climb is aimed partly at LazarBeam, who is afraid of heights; MrBeast frames it as "conquering your fear of heights." Another member stays calm and reasons, "If I'm gonna die, I'm gonna die."

With a lantern, they find a door marked "Access forbidden." Someone checks behind it and declares it safe. Someone else asks whether people might be living down there. The area feels haunted to the group. They debate whether some boards once held a "don't enter" sign that was torn down or were just decoration, and they settle on decoration and keep going. Higher up, after several more flights of stairs, they come across a "Do not pass" sign.

During this stretch, MrBeast notes that salt has been harvested from the mine for a thousand years. He uses that for a quick Feastables bit, sprinkling salt from the walls onto a dark chocolate sea salt bar, which the group says tastes good. JiDion sleeps with the group that night, and MrBeast teases another "super special guest" for the next day.

4:05

Day Three: Sam and Colby and the Haunted Altar

The group guesses who will appear on day three, naming Kai and Speed, and then realizes two shadows are coming down. The guests are Sam and Colby. MrBeast introduces them as specialists in exploring abandoned and haunted places, so he wants to see how they react to the "1000 year old tunnel system." Since the pair have more experience, they lead the way. One of them says, "We love creepy holes, you know?"

MrBeast says he never could have guessed how sketchy the deeper tunnels would get. When the path splits, Karl gives Colby a real jump scare. The group then reaches another ominous staircase with a giant cross at the top. Sam and Colby share the one thing they know about these salt mines: a legend that a single spirit was seen there, and an altar was built at that spot because "it's where the hauntings are." The reaction from the group is enthusiasm, "That sounds awesome! Let's keep going!", not fear.

Further on, they find a fenced-off opening that looks straight down onto their camp far below. MrBeast wants to see Lannan's reaction because Lannan is "terrified of heights." The others had stayed behind to upgrade base camp. Shawn and the team shout up that they now have a shower, made by turning a cap into a shower head and hanging a water jug. Lannan approaches the edge reluctantly, insisting "No one touch me," and the group calls it "overcoming our fears."

MrBeast's narration marks this as a turning point. The group had now explored 50% of the mines and had a way to wash, so the city "was finally thriving."

6:43

Day Four: Kai Cenat, the Underground Lake, and a Prank That Backfires

The day-four guest is Kai Cenat, whom MrBeast introduces as the biggest Twitch streamer on the planet. MrBeast tells Kai that "we have a big family" and that nothing will come between them. Someone immediately asks whether that's foreshadowing.

MrBeast says he saved one secret tunnel specifically for Kai. To reach it, the group crosses an underground lake by boat and climbs through a hole in the wall, with a boost from Shawn. Inside the hole is a door. Kai jokes that in movies, getting past the door is where everyone dies, and gives a deliberately nonsensical "game plan" full of lefts, rights, and steps backward.

The tunnel opens into what MrBeast calls "a giant dark void." He had been told this was the second cavern, as large as the first, so he brought what he calls the world's brightest flashlight to reveal it. The group calls the sight unreal. Despite warnings about ledges, Kai jumps down into the cavern, and the others follow. Inside, their voices echo strangely.

Once the others are down in the middle of the cavern, MrBeast switches off the flashlight to scare them. Then he, along with others near the exit, appears to try to lock them in. "Later nerds!" is shouted, and a struggle at the door follows, with someone warning, "You're gonna break Karl's arm!" Kai confronts the group afterward, saying they heard "later losers" and accusing someone of trying to trap them there overnight. The episode is played for laughs, but the narrator notes that tensions were now running high.

That night, Karl strikes again, this time with JiDion. While everyone sleeps, they set up a mannequin on the bridge with a speaker behind it and play Kai's song "Bustdown Rollie Avalanche." The sleeping group wakes up asking whether they are being attacked. One victim swears revenge in exaggerated terms, vowing to "dedicate my entire life to their destruction." The narrator sums it up: "Lines are being drawn, enemies are being formed."

10:15

Day Five: Logan Paul, Exile, and Mayor Kai

The next morning, most of the group is still asleep after the night's prank, so the day-five guest arrives without the usual tour from "Jimmy." The guest is Logan Paul, introduced as a WWE superstar. Logan wakes MrBeast and the others. MrBeast jokes that "this video is just me seeing how many famous people I can drag in this pit."

The group then turns on the pranksters. One member declares, apparently speaking for everyone, that Karl and JiDion are being exiled. Karl's bed is thrown into the water, and Karl wakes up to Logan Paul and the news. His response: "Dude I hate this underground city, bro."

MrBeast says the prank war had started to genuinely bother some people, so Kai steps up to become mayor. Nobody seriously objects; one person votes for "the shortest person here." Mayor Kai's first act is to punish Karl and JiDion for the prank by making them sleep in the elevator. Others immediately object that this means everyone else must take 15 flights of stairs, and one asks why Kai is mayor at all, given that Kai only just arrived. The narrator notes the city's population has grown to nine YouTubers and warns that "everything you're gonna witness from here on out is just pure chaos."

Kai's next order is a dedicated storage area away from the beds. The others point out that this does nothing except force them to walk for their clothing. MrBeast concludes that making Kai mayor "wasn't such a great idea."

12:47

The Fake Dead End and the Sponsor Reveal

While the newer arrivals stay at camp, MrBeast takes "the day one boys" on a daily exploration. He says they have now explored "just about every tunnel and room," but he has one special spot left. He shows them what looks like a dead end and reveals it as a fake door hiding a giant tunnel. The tunnel is so long they have to run down it, and someone calls it the longest tunnel they have ever seen. At the end is a Zaxby's restaurant, which MrBeast says he built. The segment is the video's sponsorship, promoting a limited-time MrBeast Box and a Feastables giveaway. Afterward, the group agrees that "the other people in the city do not need to know about this."

The "York New City" Coup and Its Collapse

MrBeast admits that what he failed to anticipate was what happens when "a bunch of content creators" are left alone with nothing to do for hours. Back at camp, the newer arrivals, whom one of them calls the "new gens," had moved the day-one crew's beds onto the bridge. When MrBeast's group returns, the others are wearing ski masks and call a town hall meeting to present "the new changes."

The meeting is a slideshow. It welcomes everyone to "York New City," shows the camp's messy "current state," and announces that the new gens will now sleep in the main area. The "day one-ers" are reassigned to the bridge, and someone is sleeping on the raft. MrBeast says he has seen enough and leads his day-one group away. The newcomers realize they can't let the day-one-ers reach base first, and both sides race back.

At camp, the group confronts Kai directly: "You've turned into a dictator." The beds are moved back. Kai quits on the spot, saying they hate being mayor because "you gotta make all the rules up and stuff and everybody gotta follow it." The conflict ends with a peace offering of food: Lunchly's for everyone, along with Prime and Feastables. The group's reviews are positive, including the remark that the cheese "tastes like actual cheese." The narrator wraps up the day as "establishing a new leader, toppling a corrupt government, and then becoming friends again."

15:52

Day Six: Vikkstar, Speed, and Playing in the Cavern

The group guesses again at the elevator, naming IShowSpeed (said to be streaming in Romania at that moment), the entire Sidemen, or Jynxzi. A huge box comes down, which MrBeast says is full of Lannan's favorite things. Day six has two guests: Vikkstar and Speed. The group jokes that they have given this tour six or seven times by now.

Speed nearly jumps from a high point toward water before being stopped. Speed then tells the group bluntly that they stink. When someone claims to have just showered, Speed insists there are no showers there and accuses them of lying. Speed finally sniffs an armpit and identifies Old Spice.

The rest of the day is mostly recreation in the cavern's facilities. Speed and Vikkstar head first for the underground soccer arena. They are surprised the group hasn't played a single game, asking what they've been doing all this time. A team match follows, and the blue team wins. The group plays golf, where MrBeast notes LazarBeam could use practice and offers $100 for a hole in one. They climb the Ferris wheel, where Logan Paul worries aloud that WWE and their fiancé would be angry if they got hurt, adding, "I'm going to be a dad. What am I doing up here?" They project a video game onto the cave wall, and someone claims they are the first people ever to play there. The camera also catches Logan without Prime, which the group treats as a rare sight.

Finally, they climb to the very top of the cave for what MrBeast calls the most insane game of catch, standing on wood that someone points out isn't even stable. To show the height, MrBeast says a Feastables bar dropped from the top took nearly ten seconds to reach the ground. They also drop marshmallows and a parachute. When a Prime bottle is thrown to Logan, Logan catches it, and MrBeast jokes, "Of course, when it's Prime, he catches it."

19:24

The Last Night and Return to the Surface

On the last night, the group builds a campfire in the amphitheater and shares favorite moments. One person enjoyed the friends they made. Another enjoyed "toppling the dictatorship," which cues a replay of the mayor saga. MrBeast says his favorite part was "dragging all these YouTubers to the middle of nowhere, deep underground, and forcing them to hang out with me," and thanks everyone for coming. He notes that with one day left, they had "really started to fill this room up."

On day seven, the group cleans up the entire camp and leaves. One recent arrival asks why everyone is leaving when they just got there; a day-one member says they've been there forever and can't wait to go. At the surface, the group sees sunlight for the first time in a week and reacts to how bright it is. MrBeast ends the video by telling viewers to go outside and "touch some grass yourself."