The state Department of Health is warning divers to avoid the water around Pearl Harbor’s Pier Mike 1 after thousands of gallons of sewage spilled in a storm drain that empties into harbor.

The department says a sewer line ruptured near the pier on Sunday. Authorities were able to contain and vacuum 12,500 gallons but 4,200 gallons entered the storm drain.

The department says military personnel and private contractors should postpone diving activities in the area for a few days until bacteria levels return to normal.