Everything Sinks!

Three movies here: The Submersion of Japan, The Sinking of Japan aka Japan Sinks, and The World Sinks Except Japan.

Translation note: the first two both have the same title in Japanese, Nihon Chinbotsu, but which were released in English with slightly different titles. The first was also known slightly as Tidal Wave.

All have English subtitles. However, Submersion of Japan defaults to a Chinese language dub, but Japanese can be easily selected in your video player. The second evidently was made for a Russian audience, and playing defaults to Russian soundtrack and subtitles but can be changed to Japanese soundtrack and English subtitles. The last is straightforwardly Japanese with English subs. 

The first is a Toho production from 1973, and has been characterized as a Godzilla movie without Godzilla. Perhaps a bit flippant, but essentially true. The monster, in this movie, is nature, or the Earth itself. ....

The second is a simply a remake of the first...the special effects are noticeably slicker, and the story itself focuses more on the different individuals. It also diverges a bit from the plot of the 1973 movie, which I will not go into, but suffice it to say that although the resolution of the story is somewhat more upbeat, I'm not sure it is an improvement on the first.

The third. Oh, the third! The World Sinks Except Japan is a broad parody of the others. ... Japanese xenophobia is a major theme in this movie, and is the basis of a lot of the humor. It is difficult to say, though, how much that xenophobia is being lampooned and how much it is being indulged. ...

Any weaknesses are more than compensated for by the ending... The simple incidental music of American folk song "Going Home" is just heart-wrenching, be sure to find the lyrics. The movie's last line, from the narrator, is heartbreakingly haunting.

Bottom line -- very different from any other Japanese movie you have probably seen, live action or anime, and definitely worth the time. It's maybe not a great movie, but it's a fun movie, and that is something lacking in a lot of moviedom. I would suggest watching the first one, then this, and saving the 2006 Japan Sinks for last. 

Final words -- it was a heckuva job finding decent copies of all these to put together! I hope everyone appreciates this effort. As far as I know, this torrent is the only source to put these three movies together. Share and enjoy!