Many years ago, an oil well crew drilled into a salt mine not too far from that area. The working salt mine was hundreds and hundreds of feet below the surface. When the drill penetrated the cavern, the workers had to hurriedly abandon the mine. Water dissolved the salt in the borehole and it enlarged enough that the bayou drained into the underground cavern and even sucked in large floating barges.
I wouldn't want to be navigating in Bayou Corne if that started happening.