What color is the communication line on the MK20 umbilical?

The communication line on the MK20 umbilical is specifically designated as red. This color coding is part of an established standard in diving equipment to ensure that divers and support personnel can easily identify different components of the diving system. The use of red for the communication line helps in quick recognition and minimizes the chances of confusion with other lines in the umbilical which serve different purposes, such as air supply or ballast. Proper identification is crucial for safe and effective communication, particularly in emergency situations underwater where divers must rely on clear and concise communication to ensure safety and coordination with surface support.