I am on the side quest “The Deluge” and the objective is to rescue the survivors trapped in the metal tower. I have been swimming around the ruins of the metal tower and I don’t see any way to climb it. I can see there is a vent opening that is under the water but I can’t latch onto it or break it open to let me swim inside. How are you supposed to get inside this tower? I can see lots of climbing things inside the tower so I am guessing I am meant to go inside here.
If you swim back a bit and get onto the nearby chunk of land, you will see that it is possible to push the tree over. This will create a bridge that gives you access to the internal shell of the tower where you can climb inside.