The Mysterious Doctor Satan (1940) Old Time Serial (OTS)

Chapter Three UNDERSEA TOMB - The Copperhead shoots out the electric circuit just as the current is turned on and escapes in the confusion. He hides in Dr. Satan's car is is taken to another criminal hideout where he climbs the outside of a a twelve-story building to overhear Dr. Satan's scheme to salvage the control device from the sunken yacht. The Copperhead is discovered but escapes after a thrilling fight on the roof and a desperate slide down the elevator cable. To forestall Dr. Satan's salvage plan, Professor Scott and his friends plan to blow up the sunken yacht. Bob Wayne and Lois Scott are in a diving bell directing the placing of the explosives when Dr. Satan's henchmen attack their ship. The depth charge is exploded during the ship fight, and the ocean pours into the broken diving bell. To Be Continued,