From Dust Game Guide

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                                 | High Tides |                            [S8]
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This one introduces two new totem powers: engulf all and infinite earth. You'll
also want to make the most of totem-moving to get through this quickly.

Start by sending some people for the jellify water totem. You'll need to wait
for the water to empty out of the middle area before you can build a bridge 
across. Once they've constructed a village, send someone for the repel water 
knowledge. By this point, you should see how the tide works. Wait for it to go
out again and rebuild the bridge so that your first village gets the repel 
water knowledge. Now, move your first village onto the land bridge that you 
made to connect the two villages. Do whatever you have to do to clear the 
water and build up the land. Do NOT use jellify water if you don't absolutely
have to. It'll mess up the cycle of the tides and you'll wind up always having
water in the middle, which isn't what you want if you're doing this my way.

Of course, there are multiple ways to do this, but the way I've done it 
requires as little work from the laughably bad A.I. as possible. They just 
have to walk from Point A to Point B. First, when the water is almost 
completely drained from the middle area, jellify it. You will need to work 
very quickly here. Remove water from around the center totem with the infinte
earth power so that you can send men to it. Also clear water so that there's 
a path. Now, while they're moving to the totem, move the jellify water totem
as close to the infinite earth totem as you can. Quickly scoop out as much 
water as possible from the surrounding area. When the jellify water totem is 
set down, you will lose the jellify water ability, even if it still has time 
left, which is why you need to clear as much water out as possible. Don't 
forget to use amplify breath here.

What this does, however, is give you a shorter recovery time. Instead of 
waiting a full 60 seconds to use jellify water again, you only have to wait 
until the men raise the little huts and complete the village. If you were 
quick about it, and somewhat lucky, you can use jellify water again before the
center village is flooded. Clear the water out and the kite guy will have 
plenty of time to bring the knowledge of repel water to the center village. 
Now, clear the water out of the last totem area and build up a wall around it
using infinite earth. When the middle area is fairly empty, use jellify water
and clear a path for some men to get over to the last totem and take it. If 
you built the wall high enough (no reason not to), then you won't even need
repel water over here. Continue using infinite earth to wall off the middle 
area and turn the whole thing into vegetation. Keep an eye on the fire plants,
though, or just move them to a rocky area. When you're ready, head for the 
portal. It's on the same island that the jellify water totem was on, but it's
only visible in low tide.