Two WW1 cave entrances Viikki, Helsinki, Finland

Two First World War cave entrances (VIII:7 and VIII:8) in [Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) land front defense line in Viikki, Helsinki, Finland. The base was built in 1915 - 1918. Western cave is 60 m² and eastern 62 m². More info: * [Location in Google Maps](https://goo.gl/maps/DU6KWz4XcV4pHS1F6) * [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=112.1000011958) (only in finnish) Source: Objaverse 1.0 / Sketchfab