An experimental submarine developed for deep-ocean operations. It was used by the Rebellion to escape the Nankatsu Submersible Proving Grounds.

There are two known types of Guardian-class submersibles, one seemingly combat-orientated, and one noncombat. Guardian One, the vessel used by Macallan, Tulley, Harlequinn, and Anton seems to be noncombat and is probably made of different systems than the Hei Ten Shi, so crush depth isn't a problem. However, Guardian Two seems autonomous and combat orientated.

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