⚠️Spoiler⚠️
I assume it is the last part because the light is already very low.
So when you get to the other side of the water, you go up the stairs and there's a hole you can jump to, that's the farthest I could go. I can see what it looks like a wall in front of me but I can't see anything else. I've tried random jumps in that direction but no luck. I mean, having to replay the whole level to try a random jump it's not ideal.
I even tried to "cheat" a little by making a "human bridge" because when the character is dead, its body still has a collider, but still couldn't see where I had to go. 😕