The failure of the original copyright holder to renew the film's copyright resulted in it falling into public domain, meaning that virtually anyone could duplicate and sell a VHS/DVD copy of the film. Therefore, many of the versions of this film available on the market are either severely (and usually badly) edited and/or of extremely poor quality, having been duped from second- or third-generation (or more) copies of the film.
The earthquake depicted in the movie was historically correct. The Chungpu Earthquake was a magnitude 7.1 earthquake which occurred on December 17, 1941 at 03:19 local time, and was centered on the town of Chungpu in Taiwan which was a Japanese colony at the time of the quake. It was the fourth-deadliest earthquake of the 20th century in Taiwan. 358 people died and a further 733 people were injured. 4,520 dwellings were completely destroyed, and 11,086 were partially destroyed. As it hit just ten days after the Japanese attack on Pearl Harbor, false rumors were spread that the earthquake was caused by retaliatory United States bombing.