Related Clues:

• Signal for a good samaritan
• Distress sig.
• Ocean's "911"
• Help-wanted sign?
• ABBA song
• 'Help wanted'
• International distress sig.
• Palindromic plea
• Coast Guard pickup
• Emergency broadcast
• Urgent letters
• ... --- …
• Cry to a St. Bernard?
• Mariner's 'Mayday!'
• Letters in the sand, perhaps