Instruct: Classify the given review as either positive or negative.
Query: Unbelievable

I've read science fiction before so I know about needing to suspend disbelief while reading a story, but this one is absurd. The crew of a submersible and the 2 divers enter the secret world of Interra which exists between the upper & lower oceans of the earth. The Interreans seem advanced, but display some disturbing traits. There is a separate race of creatures which are half human-half machine who do all their work, while the Interreans mostly play. The crew & divers want to return to the surface, but the Interreans don't want people on the surface learning about Interra.This story is clearly a rewriting of The Hollow Earth by Raymond Bernard from 1976, which was also unbelievable.