The cave "Dyavolsko garlo’" (Devil`s Throat) got its name because the rocks around the cave's entrance look like a gaping mouth. If the river in The Devil's Throut carries something insde, it will never be retrieved. Some years ago, the rising river carried away 500 kilograms of wood and not a single whittle was discovered. When making research, cave specialists poured colorful water along the stream, which went out after 2 hours.
The exit of the river siphon is also quite gruesome. Cave specialists organize expeditions there, using rubber boats and sailing against the stream. Many Bulgarian and foreign cave specialists have explored the underground way of the river. Despite that, it remains a mystery even nowadays.