- This area is located near a preservation area and it's by no means a hard to find the area itself. However, the hill is large and covered by a forest. So if you don't own a decent sense of direction, I would suggest you take a compass with you, as there is a really good change you'll get lost and end up to God knows where. The forest really continues forever and you can walk there quite a long time, before finding any roads, if you are lost.

- Also even when one would think that what harm could happen while walking in a forest, located nearby a major city, I would still advice to take the dangers that this place possess, into consideration when planning the trip. Mustavuori (The Black Hill) contains caves and really deep trenches and deep entrances to bunkers and caves. Falling down from one of those cliffs will kill you, be sure about that. There are no fences guarding the deep falls and during a winter, this place is best to left alone. Also the vegetation here is really dense, almost felt like walking in a primeval forest or something, meaning that you need to stay sharp all the time and scan the path you are walking. Once you start falling....there's no coming back...

- Also this forest, that resembles one movie, is now a place to stay for a certain group of people, that officially don't exist in Finland. So the photographs that I will show, are strictly unofficial. Forget that you ever saw them.

- Still despite of all this, the place is absolutely great. Even when I haven't seen every part of Krepost Sveaborg, I could almost bet, that I wont find a place that is as interesting as Mustavuori is.

- This is not a political statement of mine and really doesn't reflect my ideology by no means.

- Entrance to one of those caves. I actually got mixed in my calculations, that how many caves and tunnels this area contains, but let's just say that there were more than five of these kind of caves. Some of them had a tunnel leading through the rock, to the other side of the trench system. Some were just caves, build to serve as a ammunition storages.

- The funny thing is that while this place is quite isolated and not many people wonder in the woods, I still started to hear some people talking somewhere. The voices kept on coming closer and finally when I reached to the bottom of one of these caves, I saw two guys descending from another direction. One of them had a camera also and my first thought was that hey, they are also Urban Explorers. So I got closer and started talking with them and that turned out quite interesting. The other one asked that have I seen anything interesting and of course I started immediately babbling about interesting cave located few hundred meters from here. Both of the guys looked each others, like I was nuts and finally the other one asked: "Have you seen any bats?"

- While they started to climb up again, I could hear them admiring some ferns that grown here unhindered. Guess they weren't too interested about the caves...