Large tunnels are treated as surplus infrastructure
The claim is that the underground network is too extensive for an airport and therefore conceals a base or headquarters for a secret society. Its persuasive element is scale. Passengers see a small part of a large facility, while service areas continue beyond public corridors. To infer a hidden purpose from that difference, however, the visible and documented airport jobs first need a capacity budget.
A public train is already a large underground job
The airport’s own documentation describes passenger trains linking the terminal and concourses, alongside baggage infrastructure. These are continuous operational demands: people need to reach gates, connecting passengers need to move between concourses, and luggage must be handled out of the passenger circulation space.
In its July 2024 account of new vehicles entering service, DEN described four-car trains and a schedule adjusted to passenger demand. It also described expanding the available fleet. A fleet count and a train size answer different questions. Spare vehicles, maintenance and the number of trains that can circulate determine availability; people per car and time between departures determine throughput at a platform.
The airport has also publicly acknowledged the tunnel theories and made them part of exhibitions and tours. That establishes that the rumours exist; publicity is not a floor plan. The useful evidence for the underground network’s working purpose is the transport connection itself and the operational record describing how it serves passengers.
Price the space in passengers per hour
The instrument starts with the documented four-car configuration. Usable passengers per car, seconds between departures and hourly demand are adjustable assumptions. A usable load is the number that can board in the chosen scenario, including the space needed for bags; it is not asserted to be the manufacturer’s maximum occupancy.
At 80 passengers per car, a departure offers 320 places. A train every 120 seconds makes 30 departures per hour. Multiply those quantities and the selected service can move 9,600 passengers an hour past the chosen boarding point in one direction. Demand of 8,000 passengers would use 83.3 percent of that selected capacity.
Now lengthen the departure interval to three minutes. Capacity falls to 6,400 passengers an hour even though the tunnels and trains have not become smaller. The same assumed demand then exceeds capacity. Alternatively, allowing only 60 usable passengers per car reduces the two-minute service to 7,200 passengers an hour. Congestion can therefore follow an ordinary change in loading or timing without any hidden use of the underground space.
The calculation concerns a single boarding flow with the selected places available. It does not count the entire airport’s daily traffic or assume that every arriving passenger uses the same section. At intermediate stations, already occupied places must be removed from the usable boarding load. Counting the same train’s capacity at every station as if it were empty would manufacture additional transport capacity on paper.
Compute a concourse train’s throughput
Uses the four-car configuration documented in July 2024. Select usable boarding load, interval and demand for one direction at one boarding point.
The selected places available at one boarding point, in one direction.
Above 100 percent, the selected demand exceeds this service’s capacity.
Positive values leave spare boarding places; negative values indicate an hourly shortfall.
Working tape
- Usable places per departure
4 × 80 = 320 - Departures in an hour
3,600 ÷ 120 = 30 - Usable hourly capacity
320 × 30 = 9,600 - Demand divided by capacity
8,000 ÷ 9,600 = 0.833333 - Share of capacity required
0.833333 × 100 = 83.333333 - Capacity minus demand
9,600 − 8,000 = 1,600
The tunnels have an observable workload
The selected four-car service offers 9,600 passenger places an hour. Demand of 8,000 passengers uses 83.3 percent of that capacity. This gives the underground scale a concrete airport task and explains why operational changes concern whole fleets, platforms and continuous guideways.
The documented infrastructure has a proportionate ordinary use: moving a recurring passenger load along a visible route. Alter the departure interval or usable boarding space and queues follow directly. The capacity constraint is something passengers can experience without leaving the public transport system.