Mass Pike Tunnel West

There are a couple of Nuka-Cola Quantums under the table in the shack beside the tunnel's entrance, along with some components. After entering the tunnel from the west side, there are some aid items to the left of the bus wreck.

The NE tunnels may have a Legendary Ghoul Reaver and a Glowing One. In the large room where these two are found, you can also find a Novice Steamer Trunk.

The Eastern side of the tunnel has a raider barricade with some scattered frag mines. There's only one raider and an auto-turret so it should be easy to clear. The door behind this leads to Mass Pike Tunnel East.

You may encounter a Legendary Ghoul Reaver inside, on the way to the SE tunnels. Head to the southern tunnels to find an Advanced terminal. After hacking it, look at the floor immediately to find an issue of Taboo Tattoos. Beside the magazine are two holotapes, the Mass Pike Tunnel Password and Det. Perry's Holotape.

There's another terminal to the left and a chem station in front of it. You can unlock the terminal using the password you just picked up however it's just connected to the next room with a broken wall with a Power Station as well.

Follow the tunnel deeper and you'll reach the generator room. You can grab the Fusion Core from the generator inside. From there, following the hallway will lead you to another exit leading to the Boston Police Rationing Site.