Why are there fans in underwater tunnels?

Proper ventilation for sewers and water tunnels is essential to provide proper airflow, containment of fumes, and dispersion of gases into the atmosphere. Fans are used to exhaust or supply air and are exposed to a multitude of harsh chemicals, temperatures and mild abrasives.



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The deepest station is Hampstead on the Northern line, which runs down to 58.5 metres. 15. In Central London the deepest station below street level is also the Northern line.

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Underground structures last a significantly longer life time than above-ground structures. Approximately about 50 years for above-ground, over 100 years for tunnels.

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Just like passing a graveyard, some drivers hold the superstition that you should hold your breath as you drive through a tunnel. Supposedly, if you can make it the lenght of the tunnel without breathing, you can make a wish at the end and said wish will come true.

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The Golden Gate Bridge, finished at almost the same time, has its own tunnel. The Funston Avenue Tunnel takes traffic approaching the bridge under the picturesque San Francisco Presidio.

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