Wenja Welcome
When you go to Dah's cage to check on him, you will find that he has been taken to the forest by the other wenja to drown him.
Head over to Dah's Mission marker to begin the mission.
You will find a bunch of wenja gathered around the hole to watch him slowly drown due to the rising water.
Speak to Dah.
If you look at the area, and turn on your hunter vision, the rocks you need to close up are highlighted in red.
Before going in the water, kill the bitefish in the water. It will cause you some trouble when you dive in.
Tip: You can use the food boost that gives you better performance in the water to help you do things faster here.
Approach the rocks and press Square to interact with them. The middle rock can't be reached without the water level rising. So do the other three first.
After closing up the leaks, release Dah from his restraints to complete the mission