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The area is called Fredriksverns Verft and is an old military area. It is open for everyone all the time, but show respect for history and keep to climbing rock, not buildings or structures please. As always, keep the area clean from trash and respectful noise levels.
Here is more info about the area: https://www.forsvarsbygg.no/festningene/finn-din-festning/fredriksvern-verft/