Building Evacuation

During our biology lecture, which was the first day of another section of chapter and new lecturer. He's 50+ years old i think, but he's quite funny, active and filled with passion in teaching the new chapter.

Unfortunately, we heard alarm buzzing the whole building. We had no idea what's happening, and some of us thought that was a sound effect of the teaching material... However the lecturer told us it was evacuation alarm buzzing. And again we thought it was just a emergency practice for the uni. We 'walked' out eventually. It was a good news for us because we could have extra hour of lunch, and I was hungry already...

A few hours later, I received an email from the university about the evacuation news:

Dear staff and students,

At approximately 10:30am this morning, Monday 23 April 2007, a gas leak was detected in the area around Professors' Walk on the Parkville campus, and the following buildings were evacuated as precautionary measure to ensure the safety of all staff and students:
Baillieu Library, Economics and Commerce, Genetics, Zoology, Biochemistry, Microbiology, Howard Florey Institute, Brownless Medical Library, Medical Building, Music (partial evacuation), Babel building (partial evacuation).

All affected buildings have been declared safe to enter by the Incident Controller from the Melbourne Metropolitan Fire Brigade Andre-occupation commenced at approximately 12.45pm.

***ALL BUILDINGS ARE NOW ABLE TO BE OCCUPIED, AND ALL CLASSES CAN PROCEED AS NORMAL.***

The gas supply has been isolated and repair works commenced. Services to the affected buildings dependant upon the gas supply will be restored as soon as possible.The evacuation was a resounding success.

I would like to thank all staff and students who cooperated with the evacuation, especially the Building Emergency Controllers and Floor Wardens.

Regards,
Stefan Delaney
General Manager, Environment, Health & Safety

in the end, the lecturer had another session of lecture which was in the afternoon, and I skipped it :P Nevertheless I gotta do my own notes, refer to the text book, power point slides and the recording lecture from afternoon session. Home study?