Scuba divers abound at the lake during spring and summer, but during fall and winter the lake is a hiker's paradise instead. (Thomas Aichinger)
From late April to early July, hiking trails are completely submerged by chilly snowmelt. (Thomas Aichinger)
(Herbert Meyrl/Corbis)
Springtime grass and flowers can still be observed at the bottom of the lake. (Thomas Aichinger)
The lake's clear water is due to meltoff from the mountains above. (Thomas Aichinger)
A scuba diver navigates a partially submerged forest in Green Lake. (Herbert Meyrl)
The temporary lake can be viewed from the mountains above. (Thomas Aichinger)
Wildflowers, tree trunks, paths and even park benches can be viewed beneath the lake's cold water. (Thomas Aichinger)
Pestilence Wort or Butterbur (Petasites hybridus) submerged in Green Lake. (Thomas Aichinger)
A diver surfaces in Austria's Green Lake. (JovanaMilanko/iStock)
A diver floats above a submerged hiking trail. (JovanaMilanko/iStock)
(Christian Zappel/Corbis)
(Thomas Aichinger)
(Wolfgang Herath/Corbis)

Explore Austria’s Underwater Hiking Trails

Catch it if you can—scuba season is short in this crystal-clear, temporary lake

smithsonian.com

Situated at the base of the Hochschwab Mountains in the southeastern state of Styria, Austria, Grüner See, or Green Lake, is unlike any other park in the world. During the colder months, it’s a hiker’s paradise—miles of trails snake across the base of the mountain range’s rambling foothills. But come springtime, a flood of melted snow cascades down the mountain range, submerging the basin-like area and transforming it into a crystal-clear, 40-foot-deep lake. For several months out of the year, a scuba mask and flippers become more appropriate than a pair of hiking boots.

The geological phenomenon has been naturally occurring for centuries and has been a secret getaway for in-the-know scuba divers, photographers and locals for decades. But only in recent years has this otherworldly body of water grown in popularity. Today, it’s a curiosity that lures adventure-seekers from around the world to its calming shores.

Because Grüner See is the result of snowmelt, its clear waters reveal a surreal scene below. Divers and swimmers can view the park’s many wooden benches, bridges, and pathways beneath the water’s surface, giving the lake an Atlantis-like feel. The meltwater also takes on an emerald-green hue thanks to the park’s ample grasses and other vegetation, which continue to thrive under water.

One local resident who feels the pull of Grüner See’s chilly waters each spring is professional photographer and scuba diver Thomas Aichinger, who has been diving for more than 25 years. He’s been visiting the lake since he was a child, and has built up a collection of wanderlust-inducing photographs that would cause any nature-starved city dweller to book the next flight to Austria.

“You feel like you’re swimming in a bottle of water—the lake is that clear,” Aichinger tells Smithsonian.com. “But you have to be careful, because if you scrape the bottom of the lake with your flippers, you can kick up sand and then have zero visibility.”

Aichinger recommends wearing the appropriate gear when diving, which includes a wetsuit, as the water temperature rarely climbs above 40 degrees Fahrenheit.

“When you’re diving, you feel like you’re flying,” he says, “since you’re swimming above the park’s submerged benches and bridges.”

(Thomas Aichinger/Corbis)

The window of opportunity for travelers to see this geological phenomenon is limited to a few short weeks and usually occurs during the spring and summer months, beginning in late April or early May. Come July, the water has started to recede, causing the lake to disappear just as quickly as it formed, leaving behind nothing more than a mirage.

For travelers who want to keep their feet on solid ground, there are several hiking trails and overlooks around the perimeter of the lake that don’t get flooded out, making it an ideal place to relax or have a picnic. For hikers, the best time to visit is during the fall or winter, when the water level drops to reveal several miles of trails. The park is also a popular spot for cross-country skiing in the wintertime when the area is blanketed in snow.

About Jennifer Nalewicki

Jennifer Nalewicki is a Brooklyn-based journalist. Her articles have been published in The New York Times, Scientific American, Popular Mechanics, United Hemispheres and more. You can find more of her work at her website.

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