Two investigations are underway into an industrial accident in Dublin, which killed one man and left his brother is in a critical condition.
Alan and Steve Harris were working on a sewer in Drumnigh Wood housing estate in Portmarnock at about 2.30pm yesterday afternoon when the incident happened.
The men were rushed to Beaumont Hospital after one of them fell into a pit and the second fell in while trying to rescue him.
45-year-old Alan Harris died and his 32-year-old brother Steve remains in intensive care today.
It is believed they entered the sewage system and one of them was overcome by methane gas when they were about five feet down into a 20ft pit.
The other brother immediately rushed to his aid but was also overcome by the gas.