Allow me to introduce myself. I am Hexachlorophene J. Goodfortune, Kidnapper-At-Large, and Devourer of Tortoises par Excellence, at your service.
If you can read this, then this sentence is false.
Whilst on the subject are all the stairways down on the actual tiles entrances to the catacombs as well?
Yes. You'll note they have a different arrow color from the normal dungeon rooms as well.