Why can the materials found in wrecks, such as steel and iron, be problematic for divers?

The materials found in wrecks, particularly steel and iron, are problematic for divers mainly because they can rust and create hazards. Rusting results in the deterioration of structural integrity, leading to potentially dangerous conditions for divers. Parts of the wreck might weaken, break off, or create sharp edges that can cause injuries. Additionally, rust can produce debris that poses a risk of entanglement or being struck by loose materials. Understanding these risks is essential for ensuring safety while exploring wrecks, as divers must be aware of the potential hazards that can arise from deteriorating materials. While the effects on compass readings due to metal may concern some divers, the direct physical hazards associated with rust and the implications for divers' safety are a primary reason for caution.