National Institute of Oceanography (NIO), Goa, had conducted offshore archaeological investigations in the same area in the late 1980s using an instrument called Side scan Scanner. One man-made structure in particular was singled out for investigation in 1991 and 1993. The drivers also found a horse-shoe-shaped object at a depth of 23 meters.
Onshore exploration near Chinnavanagiri, south of Poompuhar revealed a ring well along with megalithic black and red wares. A few ring wells were also found near Vanagiri, Tranquebar and Poompuhar. A Sangam period brick structure was unearthed near the present Kannagi statue at Poompuhar. Another L-shaped brick structure was also noticed at low tide, suggesting that a large part of ancient city of Poompuhar must have been submerged in the sea.
Onshore exploration near Chinnavanagiri, south of Poompuhar revealed a ring well along with megalithic black and red wares. A few ring wells were also found near Vanagiri, Tranquebar and Poompuhar. A Sangam period brick structure was unearthed near the present Kannagi statue at Poompuhar. Another L-shaped brick structure was also noticed at low tide, suggesting that a large part of ancient city of Poompuhar must have been submerged in the sea.
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