Seasonal submergence. My kind of cleanse. Every spring, snowmelt from the Karst mountains in Austria swells the Grüner See (Green Lake), flooding the park that rings the lagoon. For most of the year, visitors can stroll across bridges, sit on park benches and jog along footpaths. Not so from mid-May to June: the park becomes an underwater wonderland populated by waving green grass, wildflowers and leafy trees. Swiss scuba diver Marc Henauer spent a week exploring the magical expanse in his scuba gear, snapping light-dappled photographs. This Zimmermann one-piece seems suited to the park’s bifurcated existence.