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The Gyrosub was a multi-purpose vehicle used by Spy Smasher.
The Gyrosub was both a submersible and an aircraft. Spy Smasher used it to escape the development site of the Captain Nazi Project in 1944.
The depicted subject bears the likeness of Gyrosub from the DC Comics; however, the DCAU item was never named on-screen, or otherwise. The title of this article is conjecture based on the item's likeness.