RedactedNarrative: Vessel struck an unseen and unmarked submerged object causing vessel to lean heavily.  This caused a leak around the prop shaft on the Starboard Motor with water coming on board.  While taking vessel to dock to check for damages, operator struck the dock causing a hole in the fiberglass on the  Starboard  side. Vessel was towed and lifted out of water before it sank.  After lifted there is fiberglass damage below the waterline from the submerged object.