San Antonio's secret tunnels

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KSAT Explains: San Antonio’s troubled mass transit history

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The Secret $4BN Tunnel Network Under Chicago

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How a giant water tunnel saved downtown San Antonio during the flood of '98

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Tokyo Flood Prevention | Insane underground tunnel system in Japan!

Are there secret tunnels under the Colorado State Capitol?

Copenhagen: How to flood-proof a city

East San Antonio residents still feeling the effects of the flood of 1998

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Cellphones, chairs found as San Antonio River is drained, cleaned

The Secret Infrastructure Beneath NYC - Cheddar Explains

Severe flooding on the northwest side and in Leon Creek

San Antonio’s River Walk exists because of a devastating flood 100 years ago this week

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San Antonio River Walk A Tribute To Robert H H Hugman, "Father of the River Walk"

REWIND: For decades, the Dallas Underground tunnels remain largely a secret