It is in Gua Nasib Bagus (Good Luck Cave), which is located in Gunung Mulu National Park in the Malaysian territory of Sarawak on the island of Borneo.
The chamber was discovered by three British cavers, Andy Eavis, Dave Checkley and Tony White, in January 1981 during the Mulu'80 Expedition.
This long passage has a roof up to 60 metres (200 ft) high, and may require some swimming and a traversal along a ledge.
[3] Sarawak Chamber is formed in Melinau Limestone, a reef complex of Upper Eocene to Early Miocene age.
Its exceptional area is thought to be the result of the stability provided by the structure of the rocks in which it lies, dipping strata forming an anticline flank close to a syncline axis.