1.   Eventually, they came to a large set of steel doors, watched over by a single guard.

2.   Herr Bischoff then turned the second lock and together they pushed open the massive steel door.

3.   I descended and found myself facing a heavy steel door.

4.   Miguel felt sad as Firebug disappeared into the vestibule, the ugly steel door closing behind him with a clank.

5.   Rescue workers had to use special equipment to cut open the steel doors.

6.   With a last desperate heave the steel door slammed shut, slicing off the row of fingers like falling skittles.

7.   With a rusty squeak, a pair of steel doors slid inward, locking in the middle with a solid clang.

8.   Foley turned, and dragged the white steel door open.

9.   I repaired the steel door years ago, loosening the rusted hinges and straightening the guides for the bolt.