Related Clues:

• [Send assistance!]
• Help signal on the ocean
• Message often written in large letters
• Morse code ''Help!'' message
• "Help, please," to those in a sinking boat
• "Help!"
• Tar's "Help!"
• Brief alarm
• "I can't get this water out of the boat fast enough!"
• Ship's ''Help!'' signal
• Captain’s call for help
• 'We need help!' letters
• Signal of desperation
• Aptly palindromic ABBA hit
• Panicked transmission