page_title: Petrovaradin Fortress
section_title: Further works
hierarchical_section_title: Petrovaradin Fortress / History / Further works
caption_attribution_description: Author: Nenad Seguljev en:Category:Novi Sad images
context_page_description: Petrovaradin Fortress, nicknamed "Gibraltar on/of the Danube" is a fortress in the town of Petrovaradin, itself part of the City of Novi Sad, Serbia. It is located on the right bank of the Danube river. The cornerstone of the present-day southern part of the fortress was laid on 18 October 1692 by Charles Eugène de Croÿ. Petrovaradin Fortress has many tunnels as well as 16 km of uncollapsed underground countermine system.
  In 1991 Petrovaradin Fortress was added to Spatial Cultural-Historical Units of Great Importance list, and it is protected by the Republic of Serbia.
context_section_description: New plans were developed in 1751 and major works began in 1753 and lasted until 1776. When these works were under way, engineer Major Albrecht Heinrich Schroeder proposed a branched system of anti-mine tunnels to the High Military Council in early 1764. In March of the same year the plan was approved, but their construction was delayed for a number of years. During his visit to the Petrovaradin Fortress in May, 1768, Emperor Joseph II observed a military exercise with mine equipment carried out in his honor. The construction of this system of tunnels, having four levels, was completed in 1776 and the total length of the system was 16 kilometers (9.9 mi).
caption: Underground passages
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