Diving the Lac du Bourget Submerged City

Site Overview

Lac du Bourget Submerged City is a archaeology and altitude dive site in Inland France, France, reached from the base town of Le Bourget-du-Lac. The submerged city in Lac du Bourget is an archaeological site where the remains of an ancient lakeside settlement lie in deep, cold water. It is a technical altitude dive for experienced divers, with perch and whitefish among the ruins. The site reaches a maximum depth of 60 m with an average profile around 40 m and a shallow start near 20 m, which places it firmly in the technical category and means divers should hold at least an Advanced / Trimix certification. Conditions are typical of the French inland freshwater coast: visibility generally runs from 8 to 16 metres, the current is mild, and the water temperature ranges between 7 and 15 degrees Celsius with low surge exposure. The marine community is centred on European Perch, Common Whitefish, Brown Trout, Arctic Char, Common Roach, Common Rudd, and the full species list is detailed below for divers planning a trip. Lac du Bourget Submerged City is a strong representative of why Inland France diving is so highly regarded, blending the geology, history and biodiversity that define French underwater exploration. It pairs naturally with the other sites of the Inland France 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 or reef enthusiasts alike.