What rule do OPS follow in the context of two-man operation?

In the context of two-man operations, the guideline that one person operates while another supervises is pivotal for maintaining safety and efficiency. This practice enhances operational control by clearly delineating responsibilities. When one individual is dedicated to manipulating valves and equipment, they can focus entirely on the operational tasks at hand, reducing the likelihood of errors caused by divided attention. Meanwhile, the other team member, who supervises, can provide oversight, monitor for any anomalies, and ensure that safety protocols are being adhered to.

This division of labor is vital in underwater operations where communication and situational awareness are paramount. It allows for better coordination and quick response to any unexpected situations that may arise during a dive. By having one person responsible solely for operations, it facilitates a systematic approach to the tasks being performed underwater, while the supervising diver can concentrate on the broader safety considerations of the operation.

In contrast, other choices suggest different configurations that do not align with standard operational practices. For instance, the suggestion of both divers operating simultaneously could lead to confusion or overlapping actions that may compromise safety. Similarly, having one diver manage communications does not inherently address the critical need for focused operation and supervision that underpins effective safety protocols in diving operations.