Access to the capstan and winch room Access to the chain locker Access to the stores elevator control Access to the catapult machinery room Access to forced draft blower rooms Access to fan rooms CIRCLE XRAY fittings are marked with a black X inside of a black circle. These modified closures are secured during conditions XRAY, YOKE, and ZEBRA. However, personnel may open these fittings without special authorization when proceeding to battle stations or as required in routine inspection checks. You may open these closures, but you must secure them immediately after use. You will find this classification on the following  closures: Doors to magazines and handling rooms Hatches that do not have a scuttle and lead to magazines and handling rooms Access to the missile handling and check- out area compartments Scuttles in hatches to the shaft alley, pump rooms, magazines, and handling rooms Access to the gas and fuel station and filter rooms Access  to  the  oxygen-nitrogen  rooms (compressor  and  producing) Access to the switch gear room, ammuni- tion hoist, and elevators Access to the underwater log room Access to the equipment rooms that are unoccupied Scuttles for passing ammunition YOKE fittings are marked with a black Y. These  closures  are  secured  during  conditions YOKE and ZEBRA. You must have proper author- ization to open fittings with this classification when the ship is at condition YOKE or ZEBRA. You will find this classification on the following closures: Hatches that are provided with a scuttle and lead to shaft alleys and pump rooms Alternate accesses to machinery rooms Weather-deck hatches not classified as XRAY Some alternate accesses on the DC deck and  above Access to the windlass room Access to the air-compressor room Access to the air-conditioning machinery room Access to the refrigeration machinery room Access to the elevator machinery room Access to the missile director machinery room Access to the drying room CIRCLE YOKE fittings are marked with a black Y inside of a black circle. These modified fittings are secured during conditions YOKE and ZEBRA.  However,  these  fittings  may  also  be opened without special authorization when per- sonnel are proceeding to battle stations or as required in routine inspection checks. Again, you must secure these closures immediately after use. You will find this classification on the following closures: Hatches that lead to the shaft alley and pump room and do not have a scuttle Scuttles in the deck to the shaft alley and pump  room Doors at the bottom of the trunk to the shaft alley and pump room Access to the steering gear power and ram room Access to the chill room 7-17