1.   The laboratory-research mission is already eight days late getting started because of the hurricane and a dangerous hydrogen fuel leak.

2.   The new model is filled with nonflammable helium instead of the dangerous hydrogen that doomed the first generation of airships.

3.   This time though, the dirigible was filled with non-flammable helium, instead of the dangerous hydrogen that doomed the first generation designed by Count Ferdinand von Zeppelin.

4.   This time, though, the dirigible was filled with inflammable helium instead of the dangerous hydrogen that doomed the first generation designed by Count Ferdinand von Zeppelin.

5.   Workers apparently left a valve open while repairing a dangerous hydrogen fuel leak last weekend, allowing hydraulic fluid to drain out.

6.   Emergency services official Gary Allen said the site contained many chemicals, including dangerous hydrogen compounds and acid gases.