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Jaskinia Wielka Śnieżna ("great snowy cave") is a limestone cave in Mount Małołączniak in the Western Tatra Mountains, of the Carpathian Mountains System, in southern Poland. The cave is within Tatra National Park.
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With the length of 23.619 kilometres (14.676 mi), and vertical range of 824 metres (2,703 ft), it is the longest, largest, and deepest cave in Poland.

Morphology
Wielka Śnieżna has five entrances:


They are connected by a complicated system of shafts and passages. Several of them contain underground trickles, waterfalls, pools, or siphons. The cave is drained by a karst spring known as Lodowe Źródło ("icy spring").
Exploration
Jaskinia Śnieżna was discovered in 1959 by cavers from Zakopane. In 1960, it reached the depth of 545 metres (1,788 ft), which made it, at that time, the fourth-deepest cave in the world. In the subsequent years, the cave was intensively explored and connected with other caves. The exploration is still ongoing, including attempts to connect the cave to Śnieżna Studnia, second-largest cave in Poland.