Related Clues:
- It may go up in smoke
- Flashed message
- Help line?
- Brand invented by an aluminum pot salesman
- Mariner's ''Mayday!''
- Emergency letters
- Titanic's call
- Scary signal
- Plea from the sea
- Undoing, figuratively
- Castaway's call
- "--- yer old man!"
- Stranded traveler's signal, perhaps
- Seaman's "Help!"
- . . . . . .