THRESHOLD LOG 04-A7

Designation: Corridor Y-11

Apparent timestamp: 14:22 / 03:17 / --:--

Entry method: Standard office door (unmarked)

Environmental Baseline

Fluorescent panels, 4100K, steady output with no flicker.

Ambient temperature 21.4°C. Humidity 38%.

No measurable air movement. Pressure stable.

Background sound registers as low continuous hum at 58 Hz. Volume does not change with distance.

Straight hallway, estimated length 48 meters. Measured length after two full traversals: 31 meters.

Floor: commercial-grade yellow vinyl tile, 30×30 cm, no scuffs or adhesive residue.

Walls: painted drywall, same yellow, matte finish. Paint thickness inconsistent at baseboards.

Ceiling height constant at 2.7 m. No cameras, vents, or power outlets visible.

Doors appear on both sides at irregular intervals. All locked. Handles warm to the touch.

After 90 meters of travel the hallway returns the explorer to the original entry door.

The door opens onto the same corridor.

Footprints left in light dust do not accumulate. Previous tracks vanish between loops.

A single ceiling panel near the midpoint sits 4 cm lower than the others. No corresponding depression in the floor.

Timepieces advance normally for the first 11 minutes, then freeze for approximately 40 seconds before resuming.

None recorded.

Exit not achieved.

Explorer remains inside the loop.

No residual effects noted on equipment. Battery drain on recording device is 3× expected rate.