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'''Calth''' is part of [[Ultramar]], the [[Ultramarines]] Empire, and one of its most productive worlds. It is an airless world, and its surface is uninhabitable due to the deadly light of its blue sun. Calth's population lives in massive underground cavern-cities. The planet is known for its orbital shipyards, which provides many of the crafts used by the Ultramarines, as well as civil and military craft for wider use in the Imperium. The planet is also the birth place of the exiled Ultramarine 4th Company Captain [[Uriel Ventris]]