Lucretia, the evil Malic's companion, was played by 'Patricia Medina'. At the time this was filmed, she was married to Joseph Cotten who was playing good guy Captain Craig McKenzie.
Capt. Craig McKenzie:
Longitude 180 degrees, latitude zero. The Spring of 1969, the largest oceanographic ship in the world, the Japanese research vessel, "Fuji", has sailed eastwards from the Gilbert Islands to an area in the equatorial South Pacific to investigate and ...
McKenzie states that the underwater city lies at "over 11,000 fathoms", however, the deepest point in the Earth's oceans (The Challenger Deep) is only 5,960 fathoms (of course in the film's fictional reality, there may be depths unknown to us 'surface dwellers')
The movie was actually shot entirely in English. This "international version" has a running time of 105 minutes. When it was released in the United States by National General Pictures, it was cut by six minutes. Although Toho's international version runs 105 minutes, its Japanese theatrical cut is just under 90 minutes long. All the dialogue is dubbed into Japanese. The film was also reedited in the 70s as part of Toho's Champion Festival. The international and Japanese cuts are available on DVD in the US.
English, Japanese