They speak, and Lisa reveals her daughter Nina had died and today would have been her ninth birthday.

The device on her wrist sounds an alarm and a timer briefly flashes showing 11 minutes counting down.

Lisa crawls through the tunnel overcoming various obstacles like an incredibly narrow passage she must squeeze through, a platform that begins to slowly rise and almost crushes her against the ceiling, a rotting body blocking her way that falls apart as she tries to move it.

At one point the tunnel ahead of her is blocked and the device on her wrist glows red and begins to countdown from 60.

She carries on through a section that is flooding with water, and an acid pit with only a thin ledge on either side to crawl along and eventually hears a man calling out.

She sees a tattoo of a cross on the hand and realises it was Adam, who is burned alive as the fire fills the tunnel.

It then attaches itself to a part of her suit and Lisa experiences a flashback of Adam attacking her with a knife, her being stabbed and falling from the car, and a strange light in the sky.

Suddenly, a spinning blade appears in front of her, forcing her to move quickly backwards.

Lisa follows the voice into a bright white room that shows images of her life, from herself as a baby looking up at her father, to seeing her daughter fall to her death from a window.

The burned Adam creature appears above her and descends into the room and gives chase through a tunnel.

With no choice but to push forward to escape the creature, Lisa forces her way through the wires, badly injuring herself.

Fire tubes appear from the walls, a safe space opens up which the creature rolls into, and Lisa closes her eyes and waits to die.

When she reaches the acid pit, she burns off the clasp of her wrist device and discovers her own set of markings underneath - two crosses and a diamond telling her which directions to take.

She crawls inside and strange creatures - possibly aliens - can be seen moving on the other side of the walls of the womb.

She leaves the womb by another exit and enters a similar room, where she notices her wrist device on the floor and the creature stuck in a door ahead of her.

She crawls to the exit, weak with loss of blood, and finds it is merely a screen with a video of a sky.

[3] Screen Daily compared the film to Cube and noted, "It's in the sound design that the horror really plays out most effectively".

[10] "Hollywood Insider" praised the film writing, "A Tense Sci-Fi Horror Springs Up Like A Trap To Capture And Torture The Imagination".