Diving Grundlsee

Site Overview

Grundlsee is a alpine lake dive site in Styria, Austria, set among the country’s varied freshwater landscapes. Grundlsee is one of the deepest and clearest lakes in Styria, a long, narrow body of water beneath the Totes Gebirge with underwater cliffs up to sixty metres deep. The submerged rock faces and slopes are clean and dramatic, giving confident divers long sightlines and a real sense of vertical space. Fish are abundant over the cliffs, with char, trout and perch using the different depth bands through the day. Because it is deep and cold, Grundlsee is best treated as an advanced site where buoyancy and gas planning matter. A drysuit is recommended and a torch helps on the deeper walls where the light fades quickly. It pairs naturally with neighbouring Altaussee for a two-lake Styrian diving trip. Conditions are typical of Austrian inland water: visibility generally runs from 8 to 22 metres, the current is low and the water temperature ranges between 4 and 19 degrees Celsius depending on season and depth. The marine life is freshwater and centred on lake trout (brown trout), arctic char, european perch, with the full community described below for those planning a dive. Because of its advanced rating and the need for Advanced Open Water certification, Grundlsee is best approached with the right thermal protection and, where relevant, altitude or overhead training. It is a representative example of why Austrian lake diving, with its cold clarity, submerged forests and wrecks, attracts divers who want something different from tropical reefs.