Ventilation headroom
Such things are scattered in the bush along the perimeter of the hill. According to their position you can judge about the impressive size of caves that existed here in the old times.
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Mannerheim Line: Main Museum Summajarvi Summakylä Leipäsuo Suurniemi Salmenkaita Vaults Patoniemi Inkilä Muola Enkel line Taipale Where is it Plan Links
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