Part 3 - Bradbury Swimming Pool

 is an event in Act 2 of Quantum Break.

Summary
You'll find yourself in front of a swimming pool. Check the back of the building, and move into the attic. Walk through the ruins, and use the roof window to get inside. You'll find a hole in the ground that leads you to the restaurant, and when you go through, to a Chronon source. Go downstairs and open the main entrance.

Follow Beth Wilder. When you try to open the door, you'll find that the key doesn't work. Force the other door open to find a gate, then press the button to activate it. Go left through the corridor. Move to the next room, and find another time machine. Head to the other side of the room, and use the second switch. Move back towards the pool.

Follow Beth to the pool and the machine. Throw the switch to reset it, pull the level, and use your key.