[At least he's not alone in hearing it. That would be a bad sign. They used to call him the mad bomber, but hallucinating would be a step down for him.]
It could be an echo. This is an enclosed enough space that it's possible.
[Though unlikely.
Another possible explanation would be that it's a ghost, and that is one too ridiculous to voice.]
no subject
It could be an echo. This is an enclosed enough space that it's possible.
[Though unlikely.
Another possible explanation would be that it's a ghost, and that is one too ridiculous to voice.]