Prime Minister Lee Hsien Loong officially opens the Jurong Rock Caverns on Sept 2, 2014. Here are five things about this massive underground installation, which had its ground breaking ceremony in February 2007.
1) It is the first underground oil storage facility in South-east Asia. It frees up 60ha of usable land, or about 84 football fields.
2) The subterranean development goes up to 130m beneath the Banyan Basin on Jurong Island. The caverns are, at 27m high, 20m wide and 340m long, as tall as a 9-storey building.
3) The caverns will store liquid hydrocarbons such as crude oil, condensate, naphtha and gas oil. Its location complements Jurong Island's role as a petrochemicals hub. The infrastructure will support companies such as Chevron Philips, ExxonMobil and Shell.
4) The five rock caverns and 8km of tunnels, which cost a total of $950 million, are just the first phase of the project. The nine storage galleries inside will provide 1.47 million cu m of storage, or 580 Olympic-sized pools worth of space. The capacity will double once the second phase is complete.
5) This is not Singapore's first foray into large-scale underground storage. In 2008, the Singapore Armed Forces officially opened the Underground Ammunition Facility to store the military's munitions and explosives, freeing up about 400 football fields of space.
Correction note: An earlier version of the story said the cost of the Jurong Rock Caverns was $1.7 billion. The latest figure is $950 million. We are sorry for the error.