The chamber is beeping. This is to let its single inhabitant know that the process of waking him up has concluded, or at least that the chamber has done as much as it can do towards this goal. A cheery recorded voice asserts that he should not be alarmed.
There's no light outside his chamber. He might still be in space, for all he can see, but the atmospheric conditions display claims that it's safe outside.
"Be not alarmed," repeats the voice. "This process shall conclude in but two moments. The chamber shall be opened as thy body temperature reaches appropriate levels. Be not alarmed."