THRESHOLD COMPLEX EXPLORATION LOG
Designation / Log ID: 25-V22
Apparent Date/Time: 28 August 2026 / 07:41 (local) — secondary stamp reads 03:22 19 March 1963
Entry Method: Single fire door labeled “B-18 BOILER ROOM”. Door opens inward. Threshold height measures 0.0 m on entry and 0.15 m on exit.
Environmental Baseline
Lighting: overhead fluorescent banks, color temperature measured at 4100 K. Intensity constant at 148 lux.
Ambient temperature: 31.4 °C. Humidity: 48 %.
Background sound: low-frequency rumble at 47 Hz. Amplitude 28 dB.
Air movement: upward draft of 0.4 m/s from floor grates. Barometric pressure 1011.2 hPa on entry; 1007.9 hPa after 12 m of travel.
Spatial Observations
Chamber estimated 18 m long by 9 m wide by 5.2 m high. Laser measurement returns 11 m long by 12.4 m wide by 4.7 m high.
Floor: concrete with painted safety lines. Line temperature 2.1 °C below ambient.
Walls: painted brick. Paint intact on 75 % of surface. Brick temperature matches ambient.
Ceiling: exposed ductwork and cable trays. Cable tray inventory returns 9 discrete runs. Visual count remains fixed at 9 after four passes.
Repeating motif: every 3.1 m a pressure gauge is mounted at 1.4 m height. Gauge faces measure 0.22 m diameter. Needle positions are identical across all units.
Anomalies
Visual inventory of boiler units returns 3. Physical inventory returns 3. Unit height measures 3.8 m while ceiling clearance measures 4.7 m.
Floor remains level under spirit level. Measured condensate surface in the drain channel slopes 1.9° toward the east wall. Slope reverses after 6 minutes of continuous observation without change in physical orientation.
Steam pressure at primary outlet measures 0.0 kPa while valve position is fully open. Valve handwheel temperature measures 47.3 °C regardless of ambient.
Sound of burner ignition arrives 2.4 seconds before corresponding heat is detected at the floor. Delay increases by 0.4 s for every additional 3 m of distance from the west wall.
Humidity at mid-chamber remains 48 % while condensation forms on the gauge faces after 5 minutes of observation. Condensation evaporates without measurable change in local humidity.
Entity Notes
None observed.
At the 8 m mark a localized temperature spike of 9.2 °C occurs across a 2.1 m radius. Spike persists for 11 seconds then collapses. No visible source or airflow change accompanies the event.
Exit / Continuity Status
Exit achieved by retracing path to the single fire door. Door released with moderate resistance.
Exterior time on exit: 08:19 local. Elapsed interior time: 38 minutes. Wristwatch confirms same interval.
Residual effects: residual rumble audible for 9 minutes after exit. Temporary inability to resolve gauge needle positions beyond 1.8 m lasting 6 minutes. No other reported sequelae.