Greater Noida, July 26 -- Two persons died after falling unconscious inside an STP tank at a housing society in Greater Noida's Sector 150 during the intervening night of July 25 and 26, police said.

According to Noida Police, the incident took place under the Knowledge Park Police Station limits at Eldeco Society, where Shashikant Sharma (40), a worker and a resident of Gadmura village in Rajasthan's Karauli district, lost consciousness while cleaning the STP tank.

Police said Akash (22), a security guard and a resident of Itahari village in Uttar Pradesh's Firozabad district, entered the tank in an attempt to rescue Sharma but also lost consciousness inside.

On receiving information about the incident, local police and the fire servi...