Joey left his father's office and went to the second floor, where he opened a double-locked door.

But deep below the shuttered windows and double-locked doors, activity flickered in one of the basement tunnels cut into the Manhattan bedrock beneath the old house.

Roger was impatient to be inside the room with the double-locked door.

He went to the double-locked door and examined that.

"Yes," the Master Observer said and led the way through thick, double-locked doors to a vast and echoing chamber.

She said the woman had always double-locked her door when she heard any noise or activity in the hallway.

Then he stopped, for the voice had replied, "Thank you very much," and then a man had walked through the closed, double-locked wooden door.

Then the Chief closed the front door, double-locked and chained it.

As of 2013 the corridor linking the wings had a double-locked doors, and the glass panels had been covered by particle boards.

Both were protected by heavy, double-locked doors.