Like 40 or more years ago I fished a bass tournament with a guy, his boat. Practice day I noticed his depth finder was gone when we were launching, I sold it and I am getting a better one. After a short period on the water the floor of the boat was wet. Dude? we have a problem? He didn't fill the transducer holes, we had to take a couple of sheet metal screws out of his van to plug them.