Addendum 1: Video Transcript

Note: This transcript is of the CCTV recording from SCP-3673 on the afternoon of 7 July 2016, the first recorded occurrence of the anomaly.

Fifteen girls, aged from 7 to 9 and dressed in leotards and slippers, are participating in a ballet lesson. The lesson is conducted by a woman identified as Chloe Saunier, a 45 year old teacher at the ███████ College of Arts. An assistant sits at a chair, operating a tape player; she has been identified as Emily Parker, an 18 year old a student at the college.

The lesson ends. The girls huddle in groups, talking and laughing. Saunier opens the studio door. Parents come in to collect their daughters.

Ten minutes after the lesson ends, four children remain in the studio. They have been identified as Rebecca Jones, Amy Chang, Kayla Okonjo and Elizabeth Telford. Chang and Telford are lying down, looking at Telford's smartphone. Okonjo is practising her "arabesque" in front of the mirror. Jones is reading by herself, seated facing a corner of the room.

Saunier finishes speaking to parents in the doorway. She walks back into the studio, and the door closes behind her.

Okonjo begins to rehearse her "pirouette". As she turns, her grounded foot sinks slightly into the wooden floor of the studio. On her final turn, her image in the mirror stops moving. The other reflections continue motion as normal. When Okonjo spins to face the mirror, her reflection resumes synchronization, and her toe is again grounded on the studio floor.

Parker speaks to Chang and Telford, who laugh in response and resume watching Telford's phone. Parker moves back to place her chair against the studio wall. Saunier is making notes in a notebook on the far side of the room.

Okonjo is looking at one end of the mirrored wall, nearest to the studio door. She walks towards that edge of the mirror. As she reaches forward, it becomes apparent that the last panel of the mirror is recessed. Okonjo leans into the recess, looking behind the other mirrors. She walks into this passage, disappearing from view.

The scene outside the studio windows briefly changes to resemble a heavy snowstorm, then reverts to normal. Only Parker notices. She walks towards the wall with windows, craning her neck to see up through them.

Jones remains reading but drifts slowly along the floorboards towards the wall. She does not react.

Saunier begins walking across the studio towards the door. Despite her walking speed, she does not make appreciable progress across the room. She increases her pace, without obvious effect.

Okonjo walks out from behind the mirrors, and calls to Chang and Telford. Chang and Telford walk towards the recessed mirror as Okonjo again disappears into the darkened passageway. Chang puts her arm around Telford's shoulders as she walks. Her elbow remains in a fixed position in space, and her lower and upper arms lengthen accordingly as she crosses the room. The lengthened arm does not appear to have an internal skeletal structure, falling to the floor in loops. Neither girl notices.

Saunier runs across the studio with limited forward progress. She is visibly concerned. She looks around the room but does not appear to see any other person. Saunier trips and falls, causing minor abrasions to her lower arms. The floor of the studio has become irregular and rough where she is lying. Saunier stands up and continues towards the door.

Jones, still reading, has tilted to a 30 degree incline against the wall.

Parker backs slowly away from the windows to change her viewing angle. There is a small chip in the wooden floor behind her. As she steps backwards, the gap in the floor widens and deepens. Its base cannot be seen.

When Chang is approximately 2 meters from the mirror, her extended arm snaps rapidly back into place. She does not react. When Chang and Telford reach the mirror, the area previously recessed is now flat with the remainder of the mirror. Chang and Telford press on the glass. Their reflections press back.

The floor in Saunier's path is becoming increasing irregular, with sharp protrusions up to a metre in height. Saunier continues clambering forward.

Telford steps away from the mirror and begins sinking into the studio floor. Telford screams, and Chang grabs at her shoulders. Telford sinks rapidly to her waist.

Parker turns at the sound of the scream, and sees the chasm that has opened up behind her. She shouts, but keeps her balance. Panicked, Parker attempts to make a call from her cellphone, but is not successful.

Chang manages to pull Telford free of the studio floor. They sit for a moment, breathing heavily. Chang points in the direction of the far wall. Telford calls out in that direction, then both girls run towards and through the wall.

Saunier reaches the studio door, but is unable to open it. She hits the door with her fists.

Shadows are visible in the mirror.

Parker walks back towards the wall with windows, and reacts in surprise. She begins to step upwards, apparently climbing a staircase which is invisible to the camera.

Saunier turns from the door and sees Jones, who remains reading, situated halfway up the wall. Saunier calls out to Jones, who does not respond.

Telford and Chang re-emerge from the far wall, each smiling and holding a stalk of wheat or barley. They are accompanied by, and speaking with, Okonjo. Okonjo's teeth and sclera are several shades darker than before, and her knees now bend backwards, changing her gait. These alterations are not shown in Okonjo's reflection.

Saunier leaves the door, attempting to walk towards Jones, who has drifted towards the ceiling. Saunier regularly changes direction, stops in confusion, and backtracks, as if walking through a maze. Her progress is limited.

Parker reaches the top of the invisible staircase, and is adjacent to the windows, through which the afternoon sky can be seen. She slides one window open. Behind it is darkness. Parker leans her head out of the window.

Telford, Chang and Okonjo walk to an area in the center of the studio. They observe a shimmering sphere, approximately 30cm in radius, centered one meter above the floor. Telford removes her ballet slipper and cautiously pushes it into the sphere. The slipper's shape is heavily distorted, and Telford drops it in shock. It returns to its previous shape as it falls from the space.

Parker leans further through the window, then crawls out along an unseen surface beyond the window. She continues crawling until out of sight. The window slides shut behind her.

Jones, still reading, drifts back towards her original position.

Chang and Telford experiment with the spatial anomaly. Their ballet slippers and hair clips change shape and dimensions inside it before returning to normal when removed. Chang's hand accidentally slips into the space, and its fingers become grossly distended. She shrieks and pulls her hand out, at which point it returns to normal size and shape. Chang and Telford laugh. Okonjo ceases to react to the other girls, and becomes slowly more and more transparent.

Saunier has returned to the studio door. Okonjo steps out from the passageway in front of the recessed mirror, looking confused. She sees Saunier. The Okonjo in the center of the studio has now faded completely.

The window in the top corner of the studio begins to slide open.

Chang and Telford are still playing with the distortive space, pushing their arms and feet into it, and attempting to make shapes with their hands.

Jones has returned to her original position in the corner of the room.

Okonjo and Saunier call and run towards each other.

Parker's head emerges from the sliding window into the studio. She sighs, and looks to her left.

Okonjo runs through Saunier. Both turn in confusion.

The sliding window slams shut. Parker is decapitated.

Telford pokes her head into the spatial anomaly, and collapses.

Parker's head falls through the floor of the studio.

Telford convulses on the ground. Chang stares in shock.

Okonjo takes two steps back towards Saunier, then suddenly falls upwards, flying through the studio ceiling. Saunier screams.

Parker's head drops down through the studio ceiling above Chang, and lands heavily on the floor at her feet. Chang panics, running towards the mirror and through it.

The floor near Saunier vibrates, as if hit from below by a heavy object. Saunier jumps, startled. Blood begins to seep upward through the floor. Saunier looks around wildly, then grabs the handle to the studio door.

Chang is briefly visible within the mirror. She stands motionless, facing the room. A reflective liquid seeps from her open eyes and mouth.

The door to the studio opens inwards, the opposite direction to its hinge design. Saunier peers beyond it, then is abruptly pulled through it by an unseen force.

The studio door swings shut.

Chang's body in the mirror fades from view.

Jones is alone in the studio. She continues to read, oblivious.

The door closes.

The camera's view becomes completely black for three seconds.

When visuals return, Jones remains reading. A body, dressed in Saunier's clothes, is lying on the studio floor five metres behind her. The front of the head has been subjected to repeated blunt force trauma. The head of a large sledge-hammer is resting in the remains of the face.

Jones turns the page of her book. The mirrored wall recedes to an estimated distance of 500 metres. The barre remains suspended in place and begins to writhe slowly.

Behind Jones, the arms of the corpse move, grasping the handle of the sledge-hammer and lifting it out of the face. The body stands upright as if pulled. Viscous droplets of liquid spill from the hole in the front of its head.

The corpse walks approaches Jones, raising the sledgehammer. The girl continues reading.

CCTV signal cut.