We were exploring near Ponce Inlet in our skiff, found a old post several feet off a small island in the backwater in about 2’ of water. I suspected it might be part of an old dock. We started scanning the area with the MD got a hit, second shovel we hit it, thought it was a rock at first, so it was under about a foot of packed bottom sand/shells. The metal hit turned out to be some sort of spring loaded safety valve possibly off a small steam engine. Also found a very corroded gun barrel 21” long, ID of the barrel is 1/2” just laying on the bottom about 3’ from shore! Looked like a stick then I saw part of the rear sight. When I picked it up it broke into 3 pieces. Wonder how a flask from N.H. wound up on a island in Florida?