it is a diveloop. An immelman on a sitdown doesn't shoot you out the same way you came back in, look at Superman in Spain and Wildfire. Dive loops can shoot you out the same way you come in, look at Medusa West, its not exactly the same, but its close. I have seen layouts of other coasters, and they all point to a diveloop. Oh, believe me, i know the plans dont do it justice, i just like the fact where that zerog roll is located.
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Mike "Viper"