This area changes a lot based on your decisions so far - be prepared for a bit of hint-jumping!
If you are always loyal, start with these hints. If you keep trying to split up when in danger, start with these hints.
Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "Deep Underground" in Unusual Findings. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.