What equipment is advisable for diving in contaminated water?

When diving in contaminated water, using a full face mask is advisable due to the enhanced protection it provides. This type of mask covers both the eyes and the mouth, creating a secure seal that prevents contaminated water from entering the diver's respiratory system and visual field. Moreover, full face masks often include a communication system and can accommodate the use of specialized gas mixtures if needed, providing additional safety and situational awareness.

In contrast, standard masks and snorkels do not offer the same level of protection; they are designed for open water environments where contamination is not likely to be a concern. Regular wetsuits also fall short in this context, as they primarily provide thermal protection and do not protect against harmful contaminants. Open-circuit SCUBA gear is generally suitable for regular diving but lacks the protective features required when navigating through potentially hazardous environments, as it does not offer the same sealing capability that a full face mask provides. Thus, using a full face mask is the most prudent choice when diving in contaminated water to ensure both safety and effective communication.