The Wielka Sniezna cave

The limestone cave system Jaskinia Wielka Śnieżna ("big snowy cave") is located on Mount Małołączniak in the Carpathian Mountains System's Western Tatra Mountains in southern Poland. Tatra National Park has the cave. It is Poland's longest, largest, deepest and biggest cave in Poland, with a length of 23.723 kilometers (14.741 miles) and a vertical range of 824 meters (2,703 feet).

Cavers from Zakopane discovered Jaskinia Śnieżna in 1959. It was explored to a depth of 545 meters (1,788 feet) in 1960, making it the world's fourth-deepest cave at the time. In the years since, the cave has been extensively explored and linked to neighboring caves.

At a depth of 752 meters, exploration in the 1960s came to a halt at a sump or siphon, a U-shaped tunnel filled with water (2,467 ft). For the first time, cavers utilizing scuba diving equipment were able to advance past the sump in 1972. Their expedition went down to a depth of 783 meters (2,569 ft).

Following efforts, the cave was discovered to be 824 m (2,703 ft) deep. The cave is currently being explored, including attempts to connect it to Śnieżna Studnia, Poland's second-largest cave.

Length: 23.723 kilometers

Location: the Carpathian Mountains System, southern Poland