The Perfect Storm is a unique 10mm SMG with a folded stock and large flash suppressor that causes 24 points of burn damage for three seconds after each shot, which makes it very powerful. The Perfect Storm is unlocked by completing a quest found in Wavy Willard's Water Park. Look for the crocodile cartoon icon on your map to find it. It is in the northwest corner of the lakes area. Interact with the robot named "Miss Annie" in the lazy river area to begin the "Cold Case" quest. To complete the quest, do the following steps:

1. Find the Park Security Terminal and access it. Read through the terminal messages until it is revealed that the holotape with a clue is locked in the Security Office safe. The Security Office safe is built into the floor in the room with the terminal. It requires Level 0 Lockpicking skill.

2. Play the tape, then travel to Crocolossus Mountain and enter the underground "Employees Only" area. The second clue is located in a cabinet.

3. Go back upstairs and search the mailbox just outside the Crocolossus Mountain ride. The clue will lead you to the top of the Ssslither Slide. Collect the KidSecure ID from the container. It will direct you to the Clarksburg post office, south of the water park. To enter Clarksburg, you need a Hazmat Suit to survive the radiation.

4. Once you reach the post office in Clarksburg, use the terminal inside. Select "[Search By Box Number]" and choose "[Box 012]" to get Otis Pike's address.

5. Go to Otis Pike's address (southwest) and access the terminal. Read through the diary entries to get the next clue. You will then need to go to Grafton Dam.

6. After entering Grafton Steel and fighting through the Super Mutants guarding the area, find five clues at the Dam to be directed to the Woods Estate. The Woods Estate is located on the southwest shore of the lakes area, just south of the water park. It is a destroyed house. Read the note in the desk on the upper floor, then return to Miss Annie to complete the "Cold Case" quest and get the Perfect Storm 10mm SMG.