Maybe it was a CHUD!
I doubt that aliens would be in sewers, unless they have sewer-ships.
Apparently, you could make a good living once from sewage prospecting:
What we learn is...
Don't play chess when UFOs are around.
maybe it was this guy
in his profile it is stated
Off spring off the marooned ones,
Also he only belongs to one group and it is the Bobby Fischer Group
Probably connection error