Not just a hole in the ground
Another view of the entrance to MMSD's Deep Tunnel, a 300-foot-deep access shaft. The tunnel acts as a holding basin, and the entire system can hold more than 500 million gallons of stormwater.
Another view of the entrance to MMSD’s Deep Tunnel, a 300-foot-deep access shaft. The tunnel acts as a holding basin, and the entire system can hold more than 500 million gallons of stormwater.
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