[ExpatGator]

That would not have been moved by tides. It was either sunk with a vessel (most likely) or pitched overboard for some reason.

[cloudmountain]

That would not have been moved by tides. It was either sunk with a vessel (most likely) or pitched overboard for some reason.

Okay. Thanks.

[PIF]

Or it is from a now drowned ancient Greek city - seems there are more than a few such cities being discovered in the Med.