NAPOLEONVILLE (AP) — As experts predicted, a sinkhole filled with slurry water and vegetation has been slowing expanding.

Assumption Parish Police Jury spokeswoman Kim Torres says the sinkhole near Bayou Corne grew by 50 feet Thursday morning as the surrounding environment sloughs into it. Two cleanup workers in a boat near the site almost fell in and had to be rescued by airboat.

Their boat, which was tied to a tree, was eventually swallowed by the muck.

There were no injuries reported and cleanup operations have been suspended.

Officials say the sinkhole might be related to structural problems within a brine cavern drilled into the Napoleonville salt dome.

Houston-based Texas Brine Co., which owns the cavern, began shipping in equipment for a relief well Wednesday.