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 Prasanta Karmakar participated and completed the 81 km National Swimming Competition organised by the Murshidabad Swimming Association. He first participated in the competition and completed the 81 km swim in river Bhagirathi from Jangipur Barrage to Gorabazar Ghat in 12 hr 30 min (7th position) on August 31, 2003. He completed the second swim from Ahiron Barrage to Gorabazar Ghat in 12 hr 6.20 min (8th position) on August 24, 2008.