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Apr 6, 2026 - How Did Engineers Build a Massive Tunnel and Install a Hydroelectric System Inside the Alps?



600 meters beneath the Swiss Alps, engineers built a massive underground “energy battery” — the Linth-Limmern pumped storage power plant.
This video breaks down how thousands of workers excavated solid rock, constructed enormous underground caverns, and assembled multi-hundred-ton machines with millimeter precision.
From controlled blasting techniques and NATM tunneling to a specialized TBM drilling at a 40-degree incline — every engineering solution pushes the limits.
⚡ How did they control high-pressure groundwater that could destroy the project?
⚡ Why can this plant generate 1,000 MW in under 3 minutes?
⚡ And why is it considered a key solution for renewable energy storage?