The Channel Tunnel is open at both ends, so the air pressure inside the tunnel is pretty much the same as the air pressure at sea level (just a little more, since the channel tunnel is at a lower altitude than sea level).
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Simply because, and not wishing to become to pedantic, the tunnel is filled (slightly pressurised) with good old fashioned air as it is a tunnel about 75m (250 ft) deep under the sea-bed at its lowest point, and 115 m (380 ft) below sea level.
The ventilation system consists of a normal ventilating system (NVS) and a supplementary ventilating system (SVS) at each end of the tunnels. Each ventilating system consists of two fans in parallel housed in purpose-built fan stations.
The Eurostar runs at ground level so most people don't suffer from any issues at all. However, in particular when crossing the Channel Tunnel, there is a slight change in pressure and I often get “closed” ears that I have to pop. I have heard of a few people suffering from headaches when crossing the Channel Tunnel.
How deep is the Channel Tunnel? At its deepest, the tunnel is 75 metres (246 feet) below the sea level. That's the same as 107 baguettes balancing on top of each other.
1 Answer. To allow for adequate fire suppression, in the event of a vehicle fire in the tunnel. The tunnel's fire suppression system depends upon complete mixing of the released halon gas with all air, without having pockets of high (or low) halon concentration.
How fast does the Eurostar go? The Eurostar travels through the Channel Tunnel at a speed of 100 miles per hour (160kph) although when the train is outside the tunnel it reaches speed of 186 miles per hour (300 kph).
At its deepest point there is 75 metres of sea water above the tunnel. Managing water pressure was a key concern for the project engineers. The tunnel is actually designed to leak. As Eurotunnel explain on their website, 'seawater from the rocks above the tunnel drips through and is then pumped away.
Eurotunnel is now highly profitable, after a difficult start when it was held down by massive debts from the tunnel construction. Debt restructuring in 2007 reversed the company's fortunes — at the expense of thousands of small shareholders who saw their holdings slashed in value.
At €1.049 billion, Eurotunnel revenue saw an increase of 63% at a constant exchange rate, a level never before seen for this business. Revenue from the Shuttle business increased by 53% to €732 million compared to 2021, in a context marked by the return of tourist traffic, thus confirming people's appetite for travel.
If you are travelling on LeShuttle, which uses the Channel Tunnel, you stay in your car during the 35 minute journey from Folkestone to Calais. Once your car is loaded onto the deck of its shuttle and your crossing starts, you can leave your car to stretch your legs or use the on board toilets.
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