In the Paradise Valley National Park (Paradise Valley), at an altitude of 1.6 km above sea level, you can only go through

In the Paradise Valley National Park (Paradise Valley), at an altitude of 1.6 km above sea level, you can only go through tunnels to the premises where the employees of the park live. It happens that until July 1, these tunnels remain the only way to the houses for tourists. What are the tunnels in?

In the snow, the thickness of which here reaches several meters during the winter.

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