A rusty smudge: What will happen as the Titanic wreck disintegrates (2024)

The Titanic’s wreck is gradually losing its familiar shape more than 3.8km beneath the North Atlantic. Recent expedition images show that a section of the bow’s railing, still present in 2022, has fallen away. The wreck rests under pressure roughly 390 times greater than at the surface, but another implosion is unlikely: the ship has no remaining air pockets. Instead, its own 52,000 tonnes of steel are settling into the seabed, twisting and straining the hull. Cracks are widening, steel plates and beams are thinning, and decks are collapsing inward. The stern, badly damaged as it sank, is deteriorating faster than the more intact bow.

Much of the corrosion is driven by communities of microbes living in a biofilm on the wreck. Iron-oxidising bacteria, acid-producing organisms and microbes that consume rust work together and compete, forming hanging “rusticles”; one species found there, Halomonas titanicae, can break down iron. In oxygen-poor crevices, other bacteria produce compounds that become sulfuric acid and further corrode the metal. The wreck also supports unusual microbial growths, including rust formations in the Turkish Baths, where low oxygen helped preserve wood. As iron dissolves into the surrounding water, the ship acts as an iron-rich oasis in a deep ocean where soluble iron is scarce, affecting life around it as it continues to disintegrate.