The person ck ducting these experiments on these brains, including Mika, suddenly dies from massive heart failure two weeks after Mika's entombment.
The scientist leaves notes about the state of the brains, other than how to keep them alive. And so, the science / medical community takes possession lf the lab and continues keeping the brains alive, just to see the longevity of those brains. Nobody has any idea any of those brains are currently suffering different predicaments.
To Mika, he is still buried under 6 feet of earth, only God knows where. With no escape from his misery and abject torment. He would go through his short cycles of calm meditations, followed by an outburst of extreme panic with an intense desire to go about a normal daily routine, just to be reminded that his entire range of motion consists of raising his head 2 inches, and his knees and legs 2 inches. With zero side-to-side movement. His muffled screaming will always inevitably ensue. Unable to even open his tightly-bound mouth as well.