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The Secret Files: Tunguska Hints
The train driver is hiding in a lavatory, and he's lost the keys to the train.
1 of 7: Well, if we want the train to go anywhere, we will need to get them back.
2 of 7: Unfortunately, as he said, he dropped them down the toilet.
3 of 7: Thankfully we've spent the last ten minutes crawling around the sewers, so we're bound to be able to find the key.
4 of 7: If you look down here, you can see a small round window in one of the pipes, the game calls it a distributor.
5 of 7: Look in it, and Nina will see the key.
6 of 7: Getting it out will require some thinking.