Outer Wilds

- Fly to The Stranger
- Take the lift to the left of the main door (It is up the ramp and through a doorway you can see with your flashlight, rotate the device to call lift and use your flashlight on the up arrow)
- Exit lift and go through the doorway, turn right and through a second doorway to come out on top of the dam
- Over the edge of the right hand side of the dam you will be able to see the water coming out. Line yourself up with the water jet and go to the other side
- Jump off the dam
- When underwater look for the grate and go through it

Video below showing the route (credit to IDK LOL)

After entering The Stranger, you need to go all around the river until you reach The Reservoir. Get close to the dam and go underwater looking for a grate to pass through. Avoid crashing into the metal bars and get safely through to the other side and the achievement is yours! Congrats!

1. Enter the stranger from the sun side. Step outside and look at the dam, to your left. Notice the flows coming out of the two grates. Launch your scout directly over one of them.

2. Go back out to the ship bay, then go to your right, into a passage behind the alien spaceship. Summon the elevator and ride it up. Go forward and turn right. You'll come out on top of the dam.

3. Stand over your scout and jump into the water on the upstream side of the dam. Thrust down and look for your scout marker to find the grate. Slip through.