I don't understand your comment, basically the clock says "highest depth:0", and every expedition is the same floor variation with rock/bronze/bats/slime. To start the expedition it only says "Floor 12" and I can't change it, so I don't know how to progress
EDIT: Ok after reading a comment I saw you have to break rocks in one of the room to uncover stairs underneath. I don't know how I was supposed to know that, I thought we were just collecting resources