As I was saying, I can contain any mischief that might arise in that coffin, up to and including a significant explosion.
Hmmm. . . If you can define "significant," I think I can go back to sleep.
Conversion of all or part of his mass to pure antimatter would require me to collapse four bulkheads, gravitically shunt your lab outside the hull, and focus the blast away from the ship.
Okay, I lied. That's not going to help me sleep.
Were you planning on sleeping in your lab?