Shipwrecks on the seabed slowly become artificial reefs covered in coral, sponges, and barnacles.

The longer version

Hard surfaces attract settlers where soft seabed offers little to grip. Microbes film the wreck within days, then sponges, corals, tubeworms and encrusting animals arrive in succession, gradually burying the original shape under living crust.

Frames, hatchways and shadowed corners give fish shelter from current and hunters, so the structure accumulates residents much as natural reef does. Steel corrodes slowly and pigments weather away, giving the whole mass a colour closer to rock. Charts often mark these sites, since snagged nets and lines remain a hazard long afterwards. Rust and bacteria attack the metal slowly, so such a structure may persist for decades.

Where this entry sits

Oceans and Sea Life looks at the salt water that covers most of the planet, from crashing waves and tides to the darkest deep-sea trenches. Expect notes on coral, fish, whales, sharks, jellyfish, shells, and the strange creatures that live far below the surface. The full list sits on the Oceans and Sea Life page, where every entry is listed in order.