These rectangular bars of metal on the pods on Royal Caribbean's Oasis of the Seas look a bit like those things tyre fitters use to balance your car's wheels.
In fact, they are sacrificial anodes and their job is to divert the corrosive attentions of salt water away from the pods they are positioned on. When their job is done, they are simply replaced. Quick, easy and a darn sight cheaper than replacing a corroded engine.
So simple. And apparently they really work too!
Jane Archer
