Seven years after a Reddit post resurfaced images of the vast chambers beneath Jurong Island, Singapore’s underground oil storage marvel continues to fascinate people online.
The post described the Jurong Rock Caverns as standing 27 metres high, 20 metres wide and 340 metres long, stretching as deep as 130 metres underground. For many, the dimensions alone were enough to spark disbelief.
But beneath the internet’s renewed curiosity lies one of Singapore’s most ambitious engineering achievements — a hidden world carved into solid rock, built to solve a very real problem above ground: space.
A City Built Downwards
In land-scarce Singapore, every square metre matters. That reality is perhaps nowhere more evident than on Jurong Island, where petrochemical plants, refineries and global energy companies operate side by side. Rather than consume more precious surface land, Singapore chose to go underground.
According to JTC, the Jurong Rock Caverns sit around 150 metres below ground, beneath Jurong Island’s bedrock, making it Southeast Asia’s first underground liquid hydrocarbon storage facility. The scale is staggering. The caverns can safely store up to 1.47 million cubic metres of liquid hydrocarbons — equivalent to around 600 Olympic-sized swimming pools, JTC notes. It is, in many ways, Singapore’s answer to its own limitations: when there is little room left above, build below.
Hidden Beneath Solid Granite
To create the caverns, engineers had to cut through dense granite buried deep beneath the seabed. JTC describes the facility as a “subterranean wonder,” and the phrase hardly feels exaggerated. The project reportedly took 15 years from concept to completion, involving years of rock testing, excavation and safety assessments. Engineers had to ensure the surrounding rock remained stable even after blasting works.
One of the key challenges was water seepage. Because fractures in the rock could allow seawater to flow through, these pathways had to be carefully mapped and sealed. Yet engineers did not aim to block water completely.
Instead, the rock mass was kept saturated so the stored hydrocarbons could remain safely confined within the caverns. It is this balance of geology and engineering precision that turned a seemingly impossible idea into functioning infrastructure.
Singapore’s Deepest Public Works Project
JTC has described the Jurong Rock Caverns as a groundbreaking storage solution, while public descriptions of the site often note that it is effectively the height of a 54-storey building — but underground. That image alone is enough to reframe how massive the facility truly is.
Far from being an abandoned or forgotten space, the caverns remain a critical part of Singapore’s industrial ecosystem. Oil arriving from vessels at the jetty is transferred through pipelines and directed into the underground storage chambers, while teams work around the clock to monitor pressure, flow rates and tunnel safety. Above ground, a control centre tracks every valve and pipeline in real time. It is a system built not just for storage, but for constant operation.
Not Just Oil Storage
What makes the Jurong Rock Caverns so compelling is not just their scale, but what they represent. They are a blueprint for how Singapore continues to think beyond physical constraints.
JTC says the project is a reminder that “innovative thinking drives everything on the island,” even deep below its surface. For a country long defined by land scarcity, the caverns stand as proof that solutions do not always need to rise upwards. At times, the boldest ideas lie far beneath our feet.
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