CHAPTER TITLES: 1. Beneath The Ocean Floor; 2. Undersea Kingdom; 3. Arena of Death; 4. Revenge of The Volkites; 5. Prisoners of Atlantis; 6. Juggernaut Strikes; 7. Submarine Strikes; 8. Into The Metal Tower; 9. Death In The Air; 10. Atlantis Destroyed; 11. Flaming Death; 12. Ascent To The Upperworld.
This serial was the inspiration for both the Submariner and Aquaman even though it actually takes place beneath the ocean floor in a giant cavern.
Shot in 25 days.
When Republic Pictures learned that Universal was producing its "Flash Gordon" serial, it rushed this serial, using similar plot elements, into production.
The familiar trumpet call played at horse races in the US to announce post time, known as "First Call", is used to rally the troops in "Chapter 4: Revenge of the Volkites". Though it may sound to some comic and strangely out of place, it was actually a military bugle call that alerted soldiers to prepare and assemble for a formation.