Cave in WW1 base Kontula, Helsinki, Finland

Entrance to cave in First World War base VI:2 in [Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) land front defense line in Kontula, Helsinki, Finland. The base was built in 1915 - 1918. The original WW1 cave was retrofitted to ammunition factory for WW2. New entrance was build, old entrance was sealed and the cave was expanded. More info: * [Location in Google Maps](https://goo.gl/maps/NckPcgFL2uHCyTNK8) * [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=112.1000011868) (only in finnish) Source: Objaverse 1.0 / Sketchfab