People seem to be convinced Kaguya sent the battle to another dimension or, at the very least, transported them to some very odd location. I believe, on the other hand, that she simply created a new landscape. I mean when the landscape first changes, we see everyone fall downward:
People might believe this implies they got teleported, but I believe it implies she is changing the landscape. I also think its clear that Tobirama and Hiruzen are now heading toward the battlefield in order to help them. Tobirama states that he's moving to find the source of the great chakra, implying they are still in the same location they were a few minutes ago:
Conclusion:
They are not in another dimension. They did not even get transported to another part of the world. They are in the exact same location as they were before, Kaguya simply manipulated and altered the landscape to her will. This includes all of the ecology and architecture around them.
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People might believe this implies they got teleported, but I believe it implies she is changing the landscape. I also think its clear that Tobirama and Hiruzen are now heading toward the battlefield in order to help them. Tobirama states that he's moving to find the source of the great chakra, implying they are still in the same location they were a few minutes ago:
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Conclusion:
They are not in another dimension. They did not even get transported to another part of the world. They are in the exact same location as they were before, Kaguya simply manipulated and altered the landscape to her will. This includes all of the ecology and architecture around them.