After the 1971 war, another border flare-up occurred between India and Pakistan in 1984. The area of the dispute was the Siachen Glacier – the world's highest battlefield. The Glacier was under territorial dispute, but in the late 1970s and early 1980s, Pakistan began organising several tourist expeditions to the Glacier. India, irked by this development, mounted Operation Meghdoot, and captured the top of the Glacier by establishing a military base that it still maintains at a cost of more than US$1 million per day.Pakistan tried in 1987 and in 1989 to retake the whole glacier but was unsuccessful.