RedactedNarrative: Subject was operating a 21' Aluminum, remote steer, vessel with a side console.  Subject was wearing his PFD, and his ignition safety switch.  Subject was traveling west in the canal when his motor struck a completely submerged object.  Subject stated that he could not see any of the object above the water line.  The collision caused the vessel to turn to starboard, and the bow of the vessel deflected off a tree along the bank.  This caused his vessel to continue along the edge of the canal.  The bow of his vessel hit between two (2) trees along the bank.  The bow then ramped up between the two (2) trees approximately seven (7) feet.  When this occurred, the starboard stern of the vessel rode up onto the bank, and the lower unit on the motor lodged in the mud.  This prevented the vessel from sliding back down off the trees.  The sharp angle of the vessel caused the subject to slide from the operators position, to the port side.  During this movement, the subjects left leg went under the passenger side console and his ankle struck the inside, port side of the console.  This  impact caused a compound fracture to the lower leg, just above the ankle.  Neither drugs nor alcohol were a factor in this incident.