As far as I can guess, a comment on an answer that I made this morning disappeared because the parent question to which the answer (and hence my comment) was attached was deleted. I tried to find this deleted question via the tools menu, but without success. (The set-up of the tools menu here is somewhat different to MO, and I am more familiar with the latter.) Is it possible (for 10K+ users) to read deleted questions via the tools menu? If so, how?
The ability to see all deleted posts using the tools menu seems to have been removed a few months ago for some reason. I missed having this, but all I can do is point out this relevant feature request:
It now seems that we can only use the tools menu to view questions and answers that were recently deleted by someone other than the post owner (and the method to find these is given by Theo in a comment above). One way to keep links to deleted questions is by using an RSS feed.