Possible Clues:

• Catastrophic scene with nitwit regularly crushed by strongman
• Fabled submerged city
• Pursuing retreating army, Stalin devastated continent?
• In Greek legend, a beautiful island buried in the sea
• Lost island from New Testament, one in map collection
• Fabled lost continent
• Sunken naval power, per Plato
• Lost city spelled out by the lost letters in the lower half of this puzzle
• Legendary vanished island — mythical place
• Continent oddly not one seen in map collection!