Explanation: A VHF-DSC (Digital Selective Calling) distress alert is transmitted on Channel 70. This channel is dedicated solely to DSC signaling, acting as an automated "digital doorbell" to initiate calls, including distress alerts. However, it is not used for voice communication. Once a DSC distress alert is received, the international standard dictates that all subsequent voice communication regarding that distress incident takes place on Channel 16. Channel 16 is the internationally recognized distress, safety, and calling *voice* channel. Therefore, after receiving a DSC alert, you should switch your radio to Channel 16 to monitor for voice distress traffic and any further information or instructions from the vessel in distress or rescue authorities. Channels 06 and 22A are working channels and not designated as the primary international voice distress channel. Channel 70 is for DSC signaling only, not voice.