Gallows Tree - Flooded Passageways and Mill Pond - "Tail Innocence" Achievement/Trophy
After doing a fancy dive into the well for an achievement, as shown in the previous section, take a breath if you like, then dive down.
NOTES: You have no flares in this chapter, so if you're having trouble navigating underwater, go to Options > Graphics > Brightness and crank it up temporarily. Also, the next area includes rat swarms, which you'll need to avoid for the "Tail Innocence" achievement/trophy. So you may want to read ahead to see what's required.
At the bottom, follow the tunnel forward. Turn right at the first T-intersection.
Then right again at the second T.
Continue along the uneven tunnel as it slopes upward.
At the next intersection, turn left. (The vertical shaft is a dead end.)
Continue forward. (The camera shifts to show where you've been. Just continue straight ahead, down the sloping tunnel.)
Follow the next vertical shaft upward...
...until you can surface in a MILL POND surrounded by wooden ledges. (The small opening near the top of the flooded shaft leads into the nearby shack. However, the water level there is too low to climb out.)
Face the building with the wooden walkway jutting out over the pond. Swim forward along the left side of the walkway and climb out on the stone ledge. If you swim to the right, a swarm of rats appears. (The trigger tile is outlined in the screenshot above.) You'll need to avoid them if you want the "Tail Innocence" achievement/trophy.
If you do accidentally trigger them, swim down into the shaft to avoid being bitten. They won't go below the surface.
If you like, you can follow the side passageway and surface inside the shack to breathe. Wait for the rats to disperse. (A swarm lasts about 45 seconds.) Then swim back out.
Stand on the wooden walkway facing the left end of the steep wooden slope on the far side of the pond. Take a running jump onto the slope and hold Jump to leap from the slope onto the ledge next to the shack.
Crawl inside through the low opening on the left.
Pick up a large medipack (7) (143/239).
Search the drawers for a RUBBER TUBE (8) (144/239).
To avoid the rats, instead of returning through the crawlspace, drop into the water to the right of it.
Then swim forward until you can surface. Stay to the right this time, since the rat trigger tile is now on your left. Climb out of the pool on the far right.
The final rat swarm you'll need to avoid for the "Tail Innocence" achievement/trophy spawns when you approach the ledges on the far side of the pond, beyond the dividing wall. (The trigger tiles are indicated in the screenshot above.) Jump over the dividing wall into the water. Swim forward and quickly climb out on the ledge below and to the right of the doorway.
The rats spawn off to the left and swim toward Lara. Turn left and take a standing jump into the doorway. Run into the tunnel and to the right.
Then jump onto the flat ledge at the top of the slope. Lara should be safe here. Wait until you can no longer hear the rats chittering (or just count off 45 seconds). If Lara hasn't been bitten by any rats—here or in Rome—the achievement/trophy will unlock at the end of this level.
Proceed through the crawlspace at the base of the slope...
...to emerge back at the GALLOWS TREE. (Remember to stay to the left to avoid spawning the changeling!)
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