Drivers may have seen a giant silo in the middle of Ala Moana Boulevard.
According to the Department of Transportation, the cylinder in front of Ward Warehouses is called a batch filter. It lays down a layer of grout that creates a barrier to protect workers from underground water.
"It has to go down deeper than usual. It goes down about 15 feet, so when you get down that far, you get underneath the water table," DOT Spokesperson Caroline Sluyter said.
Workers are putting in conduits and underground cables as part of the Ala Moana Beautification Project.
The DOT says they expect to remove the silo by the end of the year.
About 40 students got sick and 25 of them, along with two adults, were taken to the hospital. Officials are now taking a look at what they ate for lunch.
Big Island police say a 29-year-old Captain Cook man reported being bitten by a shark while body boarding in the area of Ninole Bay.
Honolulu police are investigating two armed robberies that may be connected.