Surprise Cave (Sung Sot Cave) is situated in the center of Halong Bay‘s heritage zone. It lies on Bo Hon Island group, surrounded by the Bo Nau Cave, Me Cung Cave, Luon Cave and Ti Top Island. The cave was found by the French in 1901 and called as Grotte des surprises (Cave of the surprise).
Surprise Cave is a large cave with the size of 12.200 square meters. The cave has three compartments and high ceiling with lots of stalactites in various shapes. The ceiling’s maximal height is 30 meters. In the middle, there is a giant and beautiful stalactite pillar connecting the cave’s ground up to the roof.
The mouth of Surprise Cave is about 25 meters above the sea level. There is a stone in the shape of a horse and a long sword next to the entrance. The ancient legend has told that, after defeating the An Enemy, Thanh Giong flew to Heaven, leaving his sword and horse to reassure local people and dislodge demons. Currently, inside the cave, there are many natural images as the marks of that fierce battle. The trail of his horse became many little lakes and smashed rocks.
Surprise Cave is typical of karst caves in Ha Long Bay and has high scientific value in the field of geology.