How To Stop a Colossal Bridge Corroding

Every year a trillion dollars are spent in the US (source) in dealing with corrosion (prevention, repair, research, down time, etc).

I'm glad Britain is spending a few dollars as well, particularly in keeping the bridges upright a little bit longer.

Here Tom Scott goes through the process of checking the cables of the Humber Bridge for corrosion ten years after a gigantic dehumidifier was installed for the air inside the cables.