As part of the new dungeon improvements we've decided to slightly modify the way holes work.
Holes now have to be manually broken-open. This is done by simply right-clicking a hole and selecting "Break-open Hole" - you'll also need a tool or a weapon equipped to assist you in the process.
To go with this we've also updated the way Earthquakes work. Earthquakes will now simply break open a random amount of holes (the chance of an Earthquake has also been doubled).
Hopefully tomorrow I'll have some more info on the new dungeon content.
Also if you haven't already, make sure to check out our new sub-reddit.
Read more here: Sleepystudios.com