The map above simulates a 300-kiloton nuclear airburst over Singapore — roughly the size of a modern deployed warhead. The coloured rings show the estimated fireball, the zones of heavy, moderate and light blast damage, the reach of the thermal flash and the ionizing-radiation dose. Drag the marker or change the weapon in the full simulator to explore other scenarios.
The metropolitan area is home to about 6 million people — the rings above are drawn to real scale over their homes.
The marker is in the geographic centre of the island, over Toa Payoh and Bishan, rather than the downtown waterfront. The 1.9 km zone of total destruction covers the Toa Payoh and Bishan housing estates and Braddell; the 4.7 km collapse ring reaches Ang Mo Kio, Novena, the MacRitchie reservoir's edge and Serangoon. Third-degree burns extend to about 7.5 km over Orchard Road's northern end, Little India, Kallang, Bukit Timah and the Thomson corridor; the 14.5 km ring of broken windows covers the Central Business District, Marina Bay, Sentosa's approach, Tampines' edge, Jurong East and Woodlands' southern blocks — almost the entire island.
Singapore packs about 6 million people into 730 square kilometres, mostly in high-rise public housing, and the outer ring contains the great majority of them. Bukit Timah Hill, the island's highest point at 164 metres, is too low to shadow much. Singapore has no nuclear weapons and lies inside the Southeast Asian nuclear-weapon-free zone. See Effects of a nuclear explosion.
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