sorry for the late reply, I was out of sync due to other topics and a vacation.
The unknown area is implicitly modeled in OctoMap, it is whatever is not stored as a node (free / occupied) in the tree. So it can be as large as the maximum addressable space, 2^16 elements in each dimension. At 1 cm resolution, this is a cube of (655.36 m)^3.
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