Sure.
About the white limbo, in the book they make it as if it's some mind trick possibly due to the drugged food. In fact in a first attempt to escape THX reaches a place with some coloured lights. An assistant robot tells him that he's not in the prison area anymore but in a hospital area where bodies of people that cannot be cured are kept in stasis for organ transplants. All he can see of this area though is only still white limbo, only with some coloured lights and the robot... the assistant robot explains that it's because of the drugged food and asks him to go back to the prison area.
Another thing is that in the white limbo there are only 10 beds and any time someone is brought in, someone else is carried away (to be "consumed", meaning they kill him for organ transplant). This adds to the paranoia and explains why people there are out of their minds, not knowing when they will be carried away. Food is delivered to them inconsistently as to torture them psychologically.