In order to unlock the repeatable location "Icy Cellar" Diggy needs to dig through three extraction sites hidden in the location "Frozen Cabins" to get to the Divine Ice ❄️
Dig out as much Divine Ice ❄️ as you can and don't forget to contribute all the ice and take your coins in exchange or the construction won't move forward.
You do enjoy the ka-ching" sound of the ❄️ coins you've just earned, don't you?
Excellent, you have access to your first repeatable location "Icy Cellar" for all your hard work. You can find even more of the Divine Ice ❄️ there!