Officials are working to clear a barge that sunk in Kentucky Lock’s chamber on Saturday, the U.S. Army Corps of Engineers said.The barge carrying gravel hung on the miter sill of the lock, which caused the bow to tip and take on water, lockmaster Caleb Skinner said.Both deckhands that were working at the time remained unharmed during the incident, which occurred at approximately 7:30 a.m.