Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. SF Hydro was a Norwegian steam powered railway ferry that operated on Tinnsj in Telemark. The ferry operated between Mael and Tinnoset between 1914 and 1944, connection the two railways Rjukanbanen and Tinnosbanen. The railway was used to transport raw materials to and fertilizer from Norsk Hydro's factory at Rjukan to the port in Skien. She was the target of the Norwegian heavy water sabotage on 20 February 1944 when the ferry was sunk to 430 meters deep in Tinnsj to prevent Nazi Germany from developing nuclear weapons.

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