According to the operator, he was navigating the swan quarter narrows when he struck a submerged object.  Operator and his wife immediately noticed their vessel was taking on water.  Operator turned on his bilge and ran his boat on plane back to the juniper bay wrc access area.  After loading his vessel, operator observed a large crack in the starboard, right side, bottom of his hull.  After reviewing chart maps, operator realized that he struck the platform of a tower that used to be visible above the water line.  Operator and i are contacting the uscg aids to navigation team and are asking them to mark the obstruction.  No violations were detected and the use of alcohol and drugs did not contribute to this accident.
SWAN QUARTER