The men were unloading 50,000 lb. steel coils off the barge when it capsized, tossing them into the Mississippi River and possibly trapping them beneath the barge.
The Coast Guard shut down part of the river Tuesday and Wednesday as rescue teams scoured the muddy waters for any sign of the two men.
The barge was at the Kinder Morgan facility in Hickman, Ark., when it sank. The energy company did not own or operate the barge.