1.   A barely audible whooshing sound was emanating from a far-off ventilation shaft.

2.   All he wants is to get into the ventilation shaft where his treasure waits and get out, but circumstances keep calling him to active duty.

3.   For example, a massive ventilation shaft in the middle of the Santa Monica Mountains was not built.

4.   Russian experts say many have back entrances and ventilation shafts through which Taliban forces might escape.

5.   The crash sparked a blaze so fierce that acrid smoke billowed out of tunnel entrances and ventilation shafts.

6.   This was a difficult task -- I submerged myself in butter, then slid through the ventilation shafts -- but well worth it.

7.   A few weeks later, he crawled through a ventilation shaft while wearing the leg cast.

8.   At least two cars were set on fire, and smoke billowed from ventilation shafts.

9.   Both trucks caught fire immediately and dense black smoke quickly filled the tunnel and poured out of ventilation shafts.

10.   Crossing the grill of an Underground ventilation shaft, the ducklings slipped through the cracks, the London Fire Brigade said.