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It's not independent fiber links if they use the same tube to get into the building...just ask any backhoe operator.

my brother-in-law's construction company actually did just that. ground wasn't properly marked and the fiber got cut, multiple links

It's not uncommon to see 500 strand in one tube get cut by a backhoe. So much so it's even jargon at this point http://www.catb.org/jargon/html/F/fiber-seeking-backhoe.html

500? Those are rookie numbers.