WW1 cave entrance, Mäkkylä, Espoo, Finland

Entrance to a First World War 60 m² cave in base XXVIII:19 in [Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) land front defense line in Mäkkylä, Espoo, Finland. The base was built in 1915 - 1918. This L shaped cave contains four rooms, 2 under the concrete roof and two inside a rock. All rooms gave concrete walls and floor. Entrance wall contains metal door and ventilation shaft. The whole base contains: * 2 machine gun positions * 2 searchlight positions * 2 observations positions * 1 rifle firing position * 1 large firing position * 150 meters of trench * 3 caves More info: * [Location in Google Maps](https://goo.gl/maps/RoKFjKxx73uEfRig9) * [Wikipedia: Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) * [John Lagerstedt , Markku Saari: Krepost Sveaborg](http://www.novision.fi/viapori/eavaus.htm) * [Finnish Heritage Agency site info](https://www.kyppi.fi/to.aspx?id=112.1000007767) (only in finnish) Source: Objaverse 1.0 / Sketchfab