The continuing story of Japan's submersion into the depths.

After the immense success of Submersion of Japan in 1973 and its subsequent TV series from Toho and TBS in 1974, it should come as no surprise that Toho had contemplated a big screen sequel to the concept. First conceived back in 1977, the production would have reunited most of the principal staff from the first film, including director Shiro Moritani, special effects director Teruyoshi Nakano and producers Tomoyuki Tanaka and Osamu Tanaka. Slated for release in 1978, and literally titled "Continuation: Submersion of Japan", the proposal got far enough along that advance posters were distributed, but sadly the production never materialized on the big screen.