Underwater Concrete Pouring

I don't think I want to go diving on those pylons, but I love that they're using the activity series right up front there to protect the steel cables in the columns. See, they make a weak battery, a weak battery, a weak battery where the zinc corrodes and prevents the steel from corroding.

That's got to be a whole lot of zinc being replaced on a pretty regular basis. I wonder how much zinc costs.

Thanks to Ryan Cox for sharing the video. As always, if you find any great videos, send 'em my way.