Spiny Norman said:

The Rev Dodgson said:

Spiny Norman said:

The Sydney Harbour Bridge is just over one kilometre long.
So how can it contain more than SEVEN kilometres of hidden tunnels?
Hidden inside its steel arches is an industrial world almost nobody ever sees: human-sized tunnels, hundreds of hidden compartments, workers crawling through darkness, robots and technology keeping a 94-year-old bridge alive.
But the deeper I looked, the stranger it became.
The famous pylons aren’t actually holding the bridge up….and did you know Sydney seriously considered destroying the bridge just after it was built ?
Everyone knows the Sydney Harbour Bridge.
Almost nobody knows what’s hidden inside it.

https://www.youtube.com/watch?v=f0UWImNZRJg

“The famous pylons aren’t actually holding the bridge up…”

I’ll have a look,

but yes they are!

Nope! They don’t attach to the steel structure. :)

All the hidden parts of big structures are interesting.
I remember watching videos on some of the more modern bridges and all the climate control to prevent rust, etc