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frubam it mentioend earlier that the door was like 70cm of steel, and a rocket launcher wouldn't get you out. The heaviest tank built/tested in history has a maximum raw armour thickness of 22cm. Iirc, the modern abrahms gun can only just barely penetrate 70cm of flat steel. What you can probably expect is him somehow sawing through the joints (deja vu, angel beats?) or going through the air ventilation system, or like zael said, someone from the outside doing the job.