The man found the bomb which is around 113 kilos while fishing in Thuan An area, Phu Van District, on May 25.
The bomb suspected to date back to the American War
The case was reported to local authorities.
The 1.5-metre-long bomb has remained unexploded with a wounding radius of around 1.5 kilometres. However, some parts of the bomb have become rusty due to being left in the water for a long time.
The bomb is expected to be detonated in the next two days.