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€382 Million Investment in Finland Alone: 3,500 Blasts and 53,000 M³ of Concrete – a Massive Cave Was Excavated Into the Rock, Where the Wastewater of up to 600,000 People Flows for Purification

Summary by T&T
The excavation of Sulkavuori in Tampere began in 2018. Now the Central Wastewater Treatment Plant is ready to receive wastewater from no fewer than six municipalities. Before that, it was necessary to prevent groundwater and toxins from the old landfill from entering the cave system.
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The excavation of Sulkavuori in Tampere began in 2018. Now the Central Wastewater Treatment Plant is ready to receive wastewater from no fewer than six municipalities. Before that, it was necessary to prevent groundwater and toxins from the old landfill from entering the cave system.

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T&T broke the news in on Monday, November 24, 2025.
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