The Undersea Kingdom starring Crash Corrigan was a 1936 movie serial by Republic Pictures.
I don't know much about the Juggernaut (Tank) other than its a fun and interesting part of this old timey serial.
While not nearly as good as other serials of the period, such as Flash Gordon with Buster Crabbe,
it had many good stunts and action sequences and marked the appearance of the famous "Republic Robots".
I couldn't let this one pass without a KoolWheelz version of the Juggernaut Tank.
The finned metal "tank" carried Unga Kahn's Robot soldiers.
It appeared to ride on four large wheels and was most likely built on a modified truck chassis.
Other than that assumption, I know nothing of its construction
My paper model is KoolWheelz scale...somewhere around 1/60 scale? give or take a Robot or two.
Find it in the Star Carz section of my website.
Its not a very difficult build, but as with all new KoolWheelz models, there will be a Build Tutorial available
also on my website...in the KoolWheelz area.
Theres also an Assembly Diagram sheet available.