1.   The gases seeped several inches into seams between segments of insulation, charring the material.

2.   The gas is seeping out of the rocks.

3.   If used, the gas would have seeped into every nook and cranny of the building, killing spores wherever they lurked.

4.   One creation allowed gas to slowly seep into a compartment to anesthetize a fruit fly.

5.   The deadly gas seeped into the cabin from a faulty propane heating and air-conditioning system.

6.   The gas seeps into basements and can accumulate in high concentrations in unventilated areas.

7.   There have been no precise measurements of the vapors in the vault but state officials confirmed that volatile gasses are seeping into it.

8.   Gas also seeped out of the mine, meaning that it could choke any miners who had found air pockets deep inside the pit.

9.   Investigators are trying to determine whether gas seeped into the building itself.