Jaskinia Wielka Śnieżna ("great snowy cave") is Śnieża limestone cave system in Mount Małołączniak in the Western Tatra Mountains, of the Carpathian Mountains System, in southern Poland. The cave is within Tatra National Park.
With the length of , and vertical range of , it is the longest, largest, and deepest cave in Poland.
Morphology
Wielka Śnieżna has five entrances:
Jaskinia Śnieżna ("snowy cave") – – discovered in 1959
Jaskinia nad Kotlinami ("cave over the kettles") – – discovered in 1966, connected to Śnieżna in 1968 Jasny Awen ("light aven") – – first explored in 1959, connected to Wielka Śnieżna in 1978 Jaskinia Wielka Litworowa ("great angelica cave") – – connected to Wielka Śnieżna in 1995 Jaskinia Wilcza ("wolf cave") – – discovered in 1996, connected to Wielka Śnieżna in 1999
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 was explored to a depth of , 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.
Exploration in the 1960s bottomed out at a sump or siphon, a U-shaped tunnel filled with water, at a depth of . In 1972, cavers using scuba diving gear were able to push past the sump for the first time. Their exploration pushed down to a depth of .
Subsequent efforts have found the cave to be deep. Exploration of the cave is still ongoing, including attempts to connect the cave to Śnieżna Studnia, second-largest cave in Poland.