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Why Do Crackers Have Holes?
Why Does Red Meat Turn Brown When Cooked?
In this video:
The holes come from a byproduct of some of the microbes added to milk to make Swiss cheese. Specifically, there are three primary types of bacteria that are typically used to make Swiss cheese (these can vary slightly depending on the manufacturer): Streptococcus thermophilus; Lactobacillus helveticus; and Propionibacterium shermanii.
Want the text version?: http://www.todayifoundout.com/index.php/2010/11/why-swiss-cheese-has-holes-in-it/