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CCR diving in the mine of Tuna Hästberg - Äventyrsgruvan, outside the city of Borlänge in Sweden October 2021. All divers are using DPV's, Video is shot in 4K.
The temperature in the air and water of the mine is ~4 degrees Celsius year around.
You can read more of Äventyrsgruvan here:
aventyrsgruvan...