What does a diver's flag look like?

The correct answer is a rectangular red flag with a white diagonal stripe, commonly referred to as the "diver's flag." This flag is widely recognized as a signal to indicate the presence of divers in the water. The red color serves as a warning to other boaters or recreational users of the water to exercise caution and maintain a safe distance from the area where divers are submerged.

The white diagonal stripe on the flag helps distinguish it from other flags and is crucial for safety, as it indicates that divers may be in the vicinity, which requires awareness from nearby vessels.

Understanding the proper representation of a diver's flag is essential for ensuring the safety of divers and for compliance with related maritime laws and regulations. Other flags mentioned do not represent diving activities and would not effectively communicate the same caution to boaters.