SCTY, Channel #79
This channel doesn't exist.
24 hours of a black screen with No Data Available on the Optimum guide. TiVo even refuses to set this channel, bringing you back to channel 2 if you attempt to get to 79.
I can vaguely remember this was Romance Classic then it changed many times and occasionally showed a blacked out game.
Now it is just darkness and the name SCTY which usually means security.