This small lake outside Stockholm, Sweden, emits otherworldly sounds as Mårten Ajne skates over its precariously thin, black ice. “Wild ice skating,” or “Nordic skating,” is both an art and a science. A skater seeks out the thinnest, most pristine black ice possible—both for its smoothness, and for its high-pitched, laser-like sounds (via).

So cool. Yet, so terrifying. The scene around the 2:08 mark, where the ice is cracking beneath his skates is really a remarkable sight. 

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