You beat me to it Lewis.....
Excellent photo of a Rhino ferry engine. It's not upside down, but swung up on it's gear to the storage/service position.
Hi Salvage, I only lay claim to knowing what it is as an observer, you will however have possibly operated one of these.
The damaged top deck of one of these Rhino barges appears now and again in the shifting sands on Utah beach, so its quite possible that the motor or part of one could be seen on the beach. I know for definite that someone local has the chain drive housing from one, that can be seen on the side of the motor. The photo attached below looks similar to and might be one of the gear casings for one of these motors, it appeared in the sands after a storm several years ago.