
The incident occurred around 6:15am in Dharmaganj area when the Dhaka-bound launch Sundarban-16 rammed into the stationary bulkhead MV Kashfa Sneha, inspector Akibul Islam, in-charge of Pagla River Police Outpost, said.
The missing workers are Md Zahurul Islam Shakil, 25, of Patuakhali, and Md Hasan, 20, of Rajapur in Jhalakathi. Three other workers on board managed to swim ashore safely.
Members of Coast Guard, Fire Service and Bangladesh Inland Water Transport Authority (BIWTA) jointly launched rescue operations shortly after the incident, said BIWTA Assistant Director Kamrul Hasan.
Inspector Akibul said dense fog may have caused the accident in the morning.
Earlier on December 14, a similar bulkhead sank in the same area following a collision, though no casualties were reported then, reports UNB.