Tamluk/Gadiara, Nov. 23: Two container vessels today collided, apparently after one of them went adrift because of a snag, in a narrow stretch of the Hooghly where tide travails compound the space problem.

The 33 sailors of the two ships are safe but both vessels were damaged and started spilling oil after the 11.30am hit at Hooghly Point, around 50km from Calcutta.