A woman has shared the creepy apartment she found hidden behind her mirror - and people are concerned that someone's been living there.
Samantha Hartsoe shared the terrifying discovery in a four-part series on TikTok where she's known as @samanthartsoe.
She explained that her New York City apartment is always cold no matter how high she turns up her heating.
"So I walk into the bathroom and I feel cold air blowing on me," she said as she shows her hair moving slightly.
Confused as to where the draft was coming from, she began searching for any possible holes - only to notice that the air was coming from her mirror.
She added: "I realised the mirror moves, let me show you what I found.
"There’s a room back there."
As she lifts the mirror from the wall, she reveals a hole with a plank of wood across the top.
What her friend thought was just used as a space to house wires and everything electrical for the building, was actually another apartment.
She sticks her phone through the wall to expose a hallway with two rooms leading off of it.
Her friend John can be heard saying: "What if there is someone living in there right now?"
Intrigued to find out what was on the other side, she put on a mask and gloves, attached a flashlight to a headband and grabbed a hammer as a "weapon".
With her friends standing in her bathroom in her apartment, she climbed through the little hole and ventured into the unknown.
As she walked around the space, she saw "signs of life".
There were black bags filled with rubbish and water bottles sprawled around the place.
Stairs down into the basement showed another door to the property which she locked, before heading back to her own flat where she said that her landlord is going to get a "fun phone call tomorrow."
Since being posted, her videos have racked up millions of likes and comments from stunned viewers.
One person said: "ARE YOU OK DO YOU NEED ME TO CALL SOMEONE."
Another wrote: "Oh my goodness."
"Girl don't say anything you just got a second apartment, " said a third.
But someone else said: "Wait you should check if your mirror is a two-way mirror."
What would you do if you discovered something like this in your house? Let us know in the comments.
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