What is this close-up picture? (WotsThat: Ship hull metal texture (macro))

Question

What object is shown in this zoomed-in close-up photo?

GalenaWatcher · Accepted Answer

Ship hull metal texture (macro). The hulls of large steel ships are protected from rust and marine growth with special anti-fouling paint, and welded steel plate hulls only became standard in the early 1900s, replacing the riveted plate designs used on ships like the Titanic.

Answer: Ship hull metal texture (macro)

More man made close-ups