Overview
The "California" Sunken Continent theory combines two claims: that California is a surviving edge of Lemuria and that tectonic unrest will eventually cause it to re-submerge.
Historical basis
Lemuria began as a nineteenth-century hypothetical lost landmass and later became a major element in Theosophical cosmology. In California, especially after major earthquakes, the idea merged easily with popular fear of coastal collapse and fault movement.
Core claim
Conspiracy and occult versions often treat California as spiritually or geologically unstable because it sits on the remnant of a prehistoric continent. In these accounts, earthquakes are not ordinary plate motion but signs of a coming return to the sea.
Evidence and assessment
Scientific geology does not support Lemuria as a real lost California homeland, and the U.S. Geological Survey specifically rejects the notion that California will fall into the ocean. The theory survives because it elegantly blends earthquake anxiety, apocalyptic imagination, and older esoteric lost-continent traditions.