A long line of vehicles get stuck in the approach to Kim Lien-Dai Co Viet underpass due to flooding - Photo: Thoa Nguyen - Photo: Thoa Nguyen

The investor, Major Projects Management Unit for Urban Development of Hanoi, had workers pump water out of the work. They blamed uncompleted main pumping system as the culprit behind the flood on Tuesday morning.

The underpass was built to ease regular traffic jams at Kim Lien-Dai Co Viet intersection. However, local residents were suspicious about effects of the work after the problem.

The underpass was reopened one hour later but people still avoided traveling through it. As a result, traffic at the intersection turned congested on Tuesday (16 June 2009).