ℹ Info · exploration: Information only: the Hölloch can only be entered with a guide from Trekking Team AG, which owns the main entrance, or as a researcher of the Arbeitsgemeinschaft Höllochforschung (AGH); there are no freely accessible entrances. All known dives were research dives on AGH expeditions (mainly 1962–1997); no arrangement for visiting divers is known.
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