FAQ/Help Needed - Unreachable Items

[Meowers]

Sorry for the size. Just took a screenshot straight from Steam.

So I'm trying to build a plumbing system, but keep having the pumps flash on and off of unreachable and I don't know why.

They've been able to build things underwater before, so it's not that and there is a lot of oxygen available on the right side. As you can see I started building tiles thinking that was the issue, but even the tile I was trying to build is also unreachable. 

There's no real clear indication as to why this is unreachable for me.

Any ideas?

 

[Mast3r07]

Build some ladders above the water untill you reach the pump on the right, finish it and the tile( its 2 tiles deep, so its reachable), dig one tile in the wall between the pools(one is enough as the water will break through), let it flow and .. profit. 

[bzgzd]

1 hour ago, Meowers said:

Any ideas?

Yes there is some bug or feature in path-finding that it doesn't go far enough when under water.

Click on dupe and then on "show navigation" and you will see where they can go like this:

But when you send him down manually with "move to" he will realize that he can walk there... only problem is he has no material there and when ho goes out for material it is again "unreachable".

So trick is to order building same thing somewhere else where it is possible and then send him down manually while he is already carrying material and he will then be able to build it.
If you want to build pipes order first to build something bigger like storage or grave to bring more materials at once.

Without water he would have no problem to see that he can go there...

http://i.imgur.com/Fd6zecd.png