Ice bubbles in Selbusjø, a lake between Selbu and Klæbu, Norway

Ice bubbles in Selbusjø, a lake between Selbu and Klæbu, Norway

© Erlend Haarberg/Alamy

Ice bubbles in Selbusjø, a lake between Selbu and Klæbu, Norway

Ice bubbles in Selbusjø, a lake between Selbu and Klæbu, Norway

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