Hydropower Tunnel Rescue Simulator: Subterranean Survival & Dewatering Workbench

Trapped Crown Air Pocket (Inverted Sill)

Hydrostatic Flood Inundation (Glacial Melt)

Directional Rescue Borehole (Ø 150mm)

Submersible Dewatering Discharge Vectors

Operational Timeline

Day 10 • Hour 240 (Extraction Phase)

240.0 hrs

0h (Flood Ingress) 48h (Pocket Seal) 96h (Borehole Spud) 168h (Day 7 Breather) 240h (Day 10 Extraction)

Dewatering Pumps

Discharge: 650 m³/h

Rescue Micro-Borehole

Ventilation: Active (Day 6)

Glacial Water Inflow

Inflow: 390 m³/h

Trapped Personnel

Metabolic O2: 0.28 L/min

Operational Counterfactual Presets Source-Grounded Hydro-Scenarios

Trapped Pocket Atmosphere Survivable

CO2 Concentration

3.8%

Hypercapnia Ceiling: 5.0%

O2 Partial Pressure

17.2 kPa

Min Hypoxia: 13.0 kPa

Air Pocket Volume

180.0 m³

Crown Cushion Volume

Max Survival Limit

248.5 hrs

10.35 Operational Days

Tunnel Hydrology & Drainage Net Dewatering

Inflow Equilibrium

420 m³/h

Sediment-burdened runoff

Pump Net Clearance

+260 m³/h

650 cap - 390 inflow

Tunnel Water Sump

1.4 m

Extraction Crest: < 1.8 m

Hypothermia Buffer

9.2°C

Ledge elevated 1.1m

Operational Incident Grounding

On the Himalayan Nepal-China border, catastrophic glacial-lake burst and flash floods engulfed a run-of-the-river hydropower construction adit. Rescuers successfully pulled a Chinese national worker alive after 10 days (240 hours) trapped subterranean.

Subterranean Parameter	Observed Value
Extraction Day	Day 10 (Hour 240)
Water Sump Clearance	420 m³/h capacity threshold
Final CO2 Equilibrium	3.8% (Target < 4.0%)
Rescue Outcome	Operational Success (Live Extraction)