Museum of Science and Industry (Chicago) of Progress event. For years, visitors entered the museum through its original main entrance, but that entrance became no longer large enough to handle an increasing volume of visitors. The newer main entrance is a structure detached from the main museum building, through which visitors descend into an underground area and re-ascend into the main building, similar to the Louvre Pyramid. In 1983, due to increased attendance, the museum started construction of its underground parking lot, located in three underground levels below the front lawn. Construction of the underground parking lot was finished in the 1990s. For over 55 years,
Structure of the Danish Armed Forces in 1989 unchallenged control of the North Sea. Additionally NAVBALTAP was to prevent amphibious landings on the Danish coast. To fulfill its mission the navy fielded a large number of minelayers and fast attack crafts. The first would have been used to mine all sealanes and potential landings beaches, while the latter would have harassed the enemy fleet with continuous hit and run attacks. At the beginning of 1989 the Royal Danish Navy consisted of the following ships. Main bases: Minor naval bases: Coastal fortifications: Sea surveillance stations: The inventory of the Royal Danish Navy in 1989 consisted of the following aircraft: