Can Google Index Your Site Pages Through Site Structure/Directories Alone?

In episode 303 of our weekly Hump Day Hangouts, one participant asked if Google can index your site pages through site structure/directories alone.

The exact question was:

Can google index your sites pages through site structure/directories alone? I’m just wondering if it is completely necessary to include internal linking if I have solid physical silo structure. Would there be an added benefit to include an internal linking structure on top of physical silo?

Source: Semantic Mastery
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