The map above simulates a 300-kiloton nuclear airburst over Chennai, India — 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 11.8 million people — the rings above are drawn to real scale over their homes.
The marker is on George Town, near Fort St. George and the harbour. The 1.9 km zone of total destruction covers the Fort, the Tamil Nadu Secretariat, the High Court, Parry's Corner and Chennai Central station; the 4.7 km collapse ring reaches Egmore, the harbour's main berths, Royapuram and the northern end of Marina Beach. Third-degree burns extend to about 7.5 km over Triplicane, Chepauk stadium, Purasawalkam, Perambur and Kilpauk; the 14.5 km ring of broken windows reaches Mylapore, T. Nagar, Anna Nagar, Tondiarpet and the Adyar river.
Chennai's metropolitan area has about 12 million people and the old northern wards inside the rings are tightly packed. The Bay of Bengal to the east absorbs roughly a third of the blast; the land is a flat coastal plain. Chennai hosts the Kalpakkam nuclear complex 60 km to the south, one of the centres of India's nuclear programme. See Nuclear arsenals.
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