RedactedNarrative: Vessel was traveling northbound towards the marked channel when it suddenly impacted with an unknown object underwater, later to be identified as a green channel marker.  Channel marker was laying completely submerged and marked with a small bottle of bleach tied to a line by an unknown source.  Operator and occupant were uninjured but vessel sustained damage to the stern/transom area and outboard  engine.
NameOfBodyOfWater: ATLANTIC
NearestCityTown: ISLAMORADA                    