The kamui dimension is similar to the hyperbolic chamber in DBZ .They are seperate dimension with infinite space .
Hyperbolic time chamber
kamui dimension
The only entrance to the hyperbolic time chamber is through one door,similarly in Naruto the only entrance through kamui dimension is Obito MS.However,since kishimoto follow some of DBZ concept,there is another way to enter kamui dimension.Remember in dbz when Goku and Picolo were fighting Biu (pink gummy alien)?Piccolo destroy the only entrance/exit to the hyperbolic time chamber, but they end up finding another way to exit the chamber by a space /time door way.They had to channel their energy to one spot inorder to exit this dimension.Sasuke current power up incooperate space/ time teleportation powers which allow him to control anything within a radius.Sasuke will used his sharinnegan to find a weakness in the real world in order to enter the other dimension.I know some of you guys will be sceptical about this ,but Sasuke eye is new and he was able to see Madara limbo dimension with ease,why he can not find another door way to kamui world?Itachi said every jutsu have a weakness,therefore kamui dimension have may have another way to exit/enter it?
Hyperbolic time chamber
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kamui dimension
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The only entrance to the hyperbolic time chamber is through one door,similarly in Naruto the only entrance through kamui dimension is Obito MS.However,since kishimoto follow some of DBZ concept,there is another way to enter kamui dimension.Remember in dbz when Goku and Picolo were fighting Biu (pink gummy alien)?Piccolo destroy the only entrance/exit to the hyperbolic time chamber, but they end up finding another way to exit the chamber by a space /time door way.They had to channel their energy to one spot inorder to exit this dimension.Sasuke current power up incooperate space/ time teleportation powers which allow him to control anything within a radius.Sasuke will used his sharinnegan to find a weakness in the real world in order to enter the other dimension.I know some of you guys will be sceptical about this ,but Sasuke eye is new and he was able to see Madara limbo dimension with ease,why he can not find another door way to kamui world?Itachi said every jutsu have a weakness,therefore kamui dimension have may have another way to exit/enter it?