What can poor visibility underwater lead to in terms of a diver's psychological state?

Poor visibility underwater can significantly impact a diver's psychological state, primarily leading to heightened anxiety levels and stress. When divers cannot see their surroundings clearly, uncertainty about depth, distance, and potential hazards can create a sense of vulnerability. This can trigger feelings of panic or anxiety, as divers may struggle to orient themselves and assess their safety and that of their dive team.

The lack of visibility can also exacerbate any pre-existing concerns, leading to increased stress. Divers may feel isolated, as they cannot easily communicate or signal to their partners, heightening the psychological pressure.

In contrast, the other options do not align with the impact of poor visibility. Navigational confidence tends to decrease in murky waters, communication challenges arise rather than improve, and fear of the unknown is often amplified rather than lessened.