Possible Clues:

• It carried Galileo into space
• In Greek legend, a beautiful island overwhelmed by sea
• Drowned city of Greek myth
• Three-quarters of the sea before one's continent has been lost
• In Greek legend, a beautiful island swallowed up by sea
• Fabulous place down-under?
• Fabled sunken city
• Legendary sunken city
• Submerged land
• Catastrophic scene with nitwit regularly crushed by strongman