No I had mine underwater twice while it was running and nothing happen. It sounded funny running underwater. It was in the floor of my boat and I was out in the bay in 3 foot waves and took on water and filled the inside of my boat up with water. I have a 1872 SeaArk. I was a 7 miles out in the bay where I live. By the time I made it to clam water I had 2 feet of water in my boat I have 32 in sides.
Zollie
Zollie