The firm and its architect, NBBJ, looked at how fast people can walk and measured the diameter of the space from multiple angles. (An "infinity-loop"-shaped pathway slopes through the building, connecting employees to each other.) In addition, the floor plan is narrower than typical offices, keeping teams in sight range of one another.

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Measurements taken early this week showed the hole measured 324 feet in diameter and is 50 feet deep, but in one corner it goes down 422 feet, said John Boudreaux, director of the Office of Homeland Security in Assumption Parish, about 30 miles south of Baton Rouge.

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Toshiba had created a hard drive that measured 1.8 inches in diameter in the late 90s.

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