Can I un-subscribe members from a thread they can't access?

[kh99]

You could execute one or both of these SQL queries:

DELETE FROM subscribethread WHERE threadid = T

DELETE FROM subscribeforum WHERE forumid = F

of course you'd change T and F to the threadid and forumid you want to remove subscriptions from.

This is pretty safe as long as you're careful not to make a typo, but it's always a good idea to have a recent backup before doing anything like this.