When the Hood Canal Bridge sank in the late 70s, one of my ex's classmates from Library school toured the Puget Sound with her Texas family in a plane they'd rented for the afternoon. They flew over what was left of the bridge and she pointed to the two chunks you could still see and said "That's what's left of the Hood Canal Bridge. It used to be the world's longest floating bridge over a saltwater tidal basin." Her father looked at it and said "Yup. Now it's the deepest."