A military structure located near Vyborg in the Leningrad Oblast, Russia, close to the historical Karelian Isthmus. This region saw significant military activity during World War II and the Cold War, including fortifications along the former Finnish-Soviet border. The specific purpose, construction date, and current condition of the site referenced by the coordinates and designation 'Ink3' are not confirmed by the available search results.
No direct historical records, technical specifications, or verified function for this particular location could be identified from the provided information.