fire shelters around the island.

The castle was severely damaged in 1715 when Russian forces set it on fire during the Great Northern War. Its final destruction took place on 31 July 1793, at 10:45 p.m., when lightning set one of the powder magazines on fire; as a result, the powder cellar exploded and almost completely destroyed the building.

Wooden constructions on the remaining powder magazine date from 1875 when the Oulu School of Sea Captains

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