What is a common underwater hazard that can cause entanglement?

Fishing line is a common underwater hazard that can pose a significant risk of entanglement for divers. It is often found in various aquatic environments, either discarded or left behind by anglers. Due to its relatively thin and strong nature, fishing line can be difficult to detect, making it easy for divers to inadvertently become entangled. This creates a dangerous situation, as entanglement can restrict movement, lead to panic, and even pose a drowning risk if a diver cannot free themselves.

While other underwater features like seagrass and coral reefs can also present hazards, they do not typically cause entanglement in the same manner as fishing line. Jellyfish, on the other hand, may pose a risk in terms of stings or allergic reactions, but they do not present a physical entanglement hazard. Understanding these risks is critical for safety and effective underwater navigation.