on ship wrecks like the Titanic, they have bulges of rust almost like icicles. What causes these bits of rust to grow?

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on ship wrecks like the Titanic, they have bulges of rust almost like icicles. What causes these bits of rust to grow?

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Those are called rusticles and there’s a particular kind of iron eating bacteria (Halomonas titanicae) that creates them. The bacteria eat the iron from the ship’s hull, pooping out rust around them.

Bacteria which eats the iron, take into account iron when is oxydized gives off energy, is a form of very low grade fuel. The bacteria eats it for energy, then leaves the oxydes, and they keep growing a bigger and bigger structure.