Two workers inhaled toxic air and died as they were working inside a septic tank without adequate protective gear - a common occurrence across the country, this time at an under-construction building in Hathazari upazila of the district on Tuesday. The deceased were identified as Md Yeasin, 27, and Md Badsha, 26. Their details could not be known immediately. Md Shamim, an official at the upazila Fire Service and Civil Defence department, said three workers entered the septic tank to clean it at Dakshin Madarsha village around 4.30pm. Two of the workers fell sick due to inhalation of toxic gas in the tank, Shamim said. On information, they rushed to the spot and pulled the workers out of the tank around 5pm, he said, adding that they were rushed to a hospital where physicians declared them dead upon arrival.   Md Alamgir, a sub inspector of Madunaghat police outpost under Hathazari police station, also confirmed the deaths.