Related Clues:

• Ship's distress call
• Song from 'Mamma Mia!'
• Brillo shelfmate
• Soap-pad brand
• Urgent request to the USCG
• "Help!" at sea
• Troubleshooting menu
• "H-E-L-P!"
• Maritime distress signal
• Sailor's "Mayday!"
• Be of service
• Call in a watery calamity
• Message in a storm
• Nine-symbol message
• Letters seeking aid