Four workers died after entering a hotel waste chamber in Ujjain, suspected gas leak during cleaning; rescue attempts claimed more lives. Ujjain, Nov 1 (PTI) Four persons died allegedly due to suffocation while cleaning a waste chamber at a hotel in Madhya Pradesh's Ujjain district, police said on. Four persons died of suspected suffocation while cleaning a waste chamber at a hotel in Madhya Pradesh's Ujjain district, police said on Sunday.