What should be done if a diver's gas supply line becomes disconnected underwater?

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When a gas supply line becomes disconnected underwater, the immediate concern is maintaining a reliable breathing gas while controlling the situation. The safest response is to stop the dive and secure the area around the line so it cannot whip or snag, then switch to your bailout gas to ensure a continuous, independent air source. Have standby support ready to assist with equipment, gas management, and any help needed to reconnect. Reconnect the line only after you’ve ensured safety, confirmed the line is secure, and verified there is still an adequate gas supply. This approach preserves life by guaranteeing breathing gas, avoiding dangerous repairs underwater, and preventing entanglement or gas loss from escalating.