Diving the Marienglashöhle

14m Max

10-25m Vis

shore

Site Overview

Marienglashöhle is a cave dive site in Flooded Mines & Caverns, Germany, reached from the base town of Thuringia. The Marienglashöhle is a former gypsum mine whose flooded lower levels form a grotto of glowing gypsum crystals, a unique and tightly guided cave dive. Its shimmering walls are unlike anything in open-water diving. The site reaches a maximum depth of 14 m with an average profile around 8 m and a shallow start near 2 m, which places it firmly in the advanced category and means divers should hold at least an Mine/Cave certification. Conditions are typical of the flooded mine environment: visibility generally runs from 10 to 25 metres, the current is weak, and the water temperature ranges between 8 and 10 degrees Celsius with low surge exposure. The marine community is centred on Signal Crayfish, Common Minnow, Common Roach, Common Rudd, European Eel, Tench, and the full species list is detailed below for divers planning a trip. The combination of tunnel, gallery topography and rock substrate gives Marienglashöhle its distinctive character within the Flooded Mines & Caverns region. Marienglashöhle is a strong representative of why German diving is so highly regarded, blending the geology, history and biodiversity that define the country's underwater exploration. It pairs naturally with the other sites of the Flooded Mines & Caverns region for a varied holiday, and with the right thermal protection and, where relevant, the correct specialist training, it offers a memorable dive for photographers, naturalists and wreck, reef or freshwater enthusiasts alike. As with every German dive, a drysuit and a careful respect for cold-water limits turn a good day into a great one.

Dive Briefing

"Entry is made by a shore entry near Thuringia, and divers should check in with a local centre in Thuringia before entering the water. The Marienglashöhle is a former gypsum mine whose flooded lower levels form a grotto of glowing gypsum crystals, a unique and tightly guided cave dive. Its shimmering walls are unlike anything in open-water diving. Plan your profile around a maximum depth of 14 m and an average of 8 m, keeping a close eye on gas and, in the deeper or enclosed sections, on the low surge. Buoyancy control matters here: the rock bottom and submerged structures are easily disturbed, and Gypsum crystal grotto, Cold water, Overhead environment are real considerations throughout the dive. The cave topography offers tunnel, gallery, and the marine life centres on Signal Crayfish, Common Minnow, Common Roach, Common Rudd, European Eel, Tench alongside the other species listed for the site. Take a moment to review the site-specific hazards with your guide, because conditions at Marienglashöhle can shift with wind and tide and change the feel of the dive. A safe ascent with a surface marker buoy and a clear exit plan completes the dive, with emergency cover routed through Druckkammerzentrum, Medizinische Hochschule Hannover."