This guide will show you how to drain the water in Sonic Frontiers. Go through the guide and follow the simple steps to do so.
The first thing you will need to do is go to this side of the map where you find a giant bullet and then side-loop it.
After that, you have to run over and then toss it into the gun. Once it’s loaded, you’ll be able to aim it. You need to aim it for the center of the giant structure and take a shot. It will activate the plug and then you can move on.