From the 3th until the 5th of May 2013, Fons, ON4AWT will activate SF3HF together with more than 20 members of the city of Sundsvalls hamradioclub SK3BG.

SF3HF will be activated from a nuclear protected armour bunker on Hemsö Island, some 40 meters into the bedrock of Storråberget mountain. The island is part of the IOTA EU-087 group and is located some 380 km north from Stockholm. The fortification was once manned by 320 people, is intact and gives a unique insight into one of Sweden's most important coastal defence installations during the cold war. More information can be found here.