Wobs knew that as he improved so too would the size of his prison.Void rabbits cultivated in the outermost layer of his sea prison. The entire prison was underwater and he only got to bathe in sunlight once every thousand years. Wobs was an odd imp, he was an Oddish.
As the years passed and wobs grew more coldhearted he realized that he was in a test subject blue and made in abyss prison. Wobs could in fact leave his cell but it was dangerous outside.