>I would say that constructing your tunnels so that rain does not mess everything up is a nice challenge of the game. But it might actually become harder when handling pressure correctly.

So let's say you constructed your base inbetween two not-so-steep hills. The hills are not an obstacle for your clonks. But there is some difference in height. Now let's say it starts to rain. And let's say your exploring the area with a clonk, or maybe attacking another base. Your attention is not at your base. You return, only to see that your whole base is underwater. It has essentially become a lake. I've seen it happen countless times. All I'm trying to say is that rain has such a HUGE influence on gameplay that it isn't rain anymore, it's more like someone from above is pouring millions of gallons of water on the ground and it will never absorb back into the air, no matter how warm it is. The only thing you can hope for at that moment is that the water will turn into ice so you can "dig it away".