The Secret Code Part 7 Submarine Signal

The Secret Code (1942) was the 19th serial released by Columbia Pictures. It features the masked hero "The Black Commando" facing Nazi saboteurs, inspired by Republic Pictures' successful Spy Smasher serial of the same year. The chapters of this serial each ended with a brief tutorial in cryptography.

[@josephfinnegan151]

Secret Code Serial: Chapter 7 of 15.
Saturday - December 10 - 2022.