Related Clues:

• ''___ yer old man!''
• Flare, perhaps
• Watery 911
• 'S O S!'
• Foundering plea
• "Help!"
• 'Help us!'
• [I'm in trouble here!]
• Three short, three long, three short
• Familiar telegraphy sequence
• Ship's distress signal
• Desperate call
• Worrisome letters
• ''Gilligan's Island'' signal
• Castaway's sand scrawl