Suppose scientists make significant progress toward conquering the mysteries of sentience. The phenomenon of sentience is isolated through experiments in which scientists design and build artificial sentient entities. Sentience is so isolated in these experiments that the artificial sentient entities have no capacity for intelligence. Each of these entities are so simple that they are capable of only one kind of sentient experience each. Some of these artificial sentient entities are designed to continually experience nothing but an extremely intense torment. The tormented entities have no ability to express what they feel. However, the scientists have a good understanding of the physical conditions that generate a sentient experience of extremely intense torment. Therefore, they do not require any means of expression from the entities they created to know that they are experiencing extremely intense torment. Is such experimentation ethical?
The scientists see nothing but positive benefits from the experiments, as more is being learned about sentience through them. Is this economic view justified? Should the private torment of the artificial sentient entities be of any concern to us? After all, their torment is nothing but a small, closed, physical process that is no threat to the economy, the environment, or any intelligent beings. Besides, these entities have no language or intelligence by which to report that they are suffering.