For many divers and underwater photographers, ship wrecks are fascinating places in their own right. They are atmospheric sites to dive, often full of interesting cargo or maybe part of a battle at sea and sunk during a fascinating period of history. For folks like me though, they are fascinating experiments that demonstrate how corals and other reef organisms colonize ‘bare ground’When a ship sinks, through explosion, scuttling, or as part of an artificial reef creation scheme it slowly becomes a reef in its own right. The holds become colonized with life that tolerates low light levels. Cranes, davits and superstructure that emerges from the wreck into the current becomes colonized in species that prefer those conditions and the hull and deck become reef walls. It is a little more complicated than that, different metals seem to be colonized at different rates and some surfaces seem resistant to colonization entirely. Sadly, scuba divers can damage coral cover on wrecks so that doesn’t help either. Here then are a few wrecks from different periods. Thankfully, not all wrecks involved the loss of life.