I was half expecting that, even after Tyrol gave his little speech about "without him, we'd all still be on that planet," Gaeta would still say, "frak it, push the button." I was getting a seriously suicidal vibe from him throughout the tail end of that episode, and his refusal to defend himself at his "trial" made me think he was just tired of living. "What kind of life do I have ahead of me, even if this somehow cleared my name? A life of eating alone in the cafeteria, a life of never being trusted or forgiven? Just end it all right now and spare me the agony."

It was good to see the chief join him in the final scene, but it's clear he's got a long road ahead of him.