What are the main hazards associated with wreck diving?

Wreck diving presents a unique set of hazards primarily due to the environment surrounding sunken vessels. The main hazards include entanglement, which can occur because wrecks often have rigging, nets, and debris that can trap divers. Overhead environments are significant dangers in wreck diving; divers can encounter confined spaces and ceilings that create risk for disorientation and challenges with air supply. Poor visibility is also a critical concern as silt and debris can obscure sight lines, making it hard to navigate and increasing the chances of getting lost or disoriented.

While strong currents and marine predators can pose risks in certain diving conditions, these are not specific to wreck diving. Factors like high altitude and rapid decompression apply under different circumstances, particularly in altitude diving scenarios. Heavy surf and strong winds are more related to surface conditions rather than the underwater environment specifically associated with wrecks. Hence, the identified hazards in the correct answer directly address the unique challenges of diving around wrecks, highlighting the importance of preparation and awareness when engaging in this activity.