The village of Tragoess (or Tragöß), Austria is home to Green Lake (or Grüner See), a small lake with a hugely variable water level. In the winter the lake is no more than 3-6 feet deep while in the spring melting glacial waters can push those levels north of 30 feet.
An underwater path. (Photo: TauchSport Steininger)
The land around the lake has been landscaped for these extreme water levels with benches and trails built for enjoyment during the low-water winter months. When the warmer weather brings higher water levels, many of those trails, benches, trees, boulders, and lawn get swallowed up by the icy crystal-clear water.
Trees swallowed by the lake. (Photo: Roman Königshofer)
This has attracted divers who enjoy swimming around the frozen-in-time landscape and taking in the long, clear views.
An underwater bridge. (Photo: TauchSport_Steininger)
This video gives a good look of what a dive in the Green Lake is like.
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