WW1 shelter entrance, Helsinki, Finland

First World War trench shelter entrance in [Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) land front defense line in base XVIII:2 Paloheinä, Helsinki, Finland. The base was built in 1915 - 1918. This shelter entrance is also featured in [separate bigger model](https://skfb.ly/6RqIu) of the base. The whole base XVIII:2 contains: * 10 firing positions * 4 shelter rooms (all collapsed) * at least 100 meters of trench More info: * [Location in Google Maps](https://goo.gl/maps/pNvP8BafL12QK4277) * [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=112.1000013727) (only in finnish)