The backup communication method between the DCC, DC repair stations, and repair party members often includes sound-powered telephones, runner messengers, handheld radios, and visual signals such as flags and lights.
The backup method of communication between the Damage Control Central (DCC), the Damage Control (DC) repair stations, and repair party members during emergency situations, particularly in naval operations, typically involves the use of sound-powered telephones, which are not reliant on the ship's power supply to function. These devices can operate through physical vibrations, allowing for communication even when electronic systems fail or are compromised. Additional backup communication methods may include the use of messenger runners, handheld radios (if still operational), or signal flags and lights for visual signaling.