This is why Swiss cheese is 'holey'.
The Secret Behind Swiss Cheese's Signature Holes, by T. M. Watson, The Shortform
Cheese Boards, Plates and Platters All Require the Right Tools - Eater
Swiss cheese whodunnit: Mystery of disappearing holes solved - National
Why do some rocks resemble Swiss Cheese?, Garlick's Notebook
What causes the holes in Swiss cheese? The mystery is over - The Boston Globe
Effective Fraud Investigations: 10 Keys to a Successful Outcome
Holy Cow! Scientists Decipher Mystery of How Swiss Cheese Holes Appear - ABC News
The Incredible Story of The US NOTAM Breakdown.
Unravelling the mystery behind holes in Swiss cheese