Find Frank Serpo | Chapter 11 - The Crash DI Riptide Guide
Last update: 11 May 2016
Open door leading to the main tower and look for stairs leading onto higher levels. Finding wounded Frank Serpo shouldn't be a problem. Talking to him finished this mission, takes you to the 12th chapter and transfers rest of survivors to the Fort.
Attention - Don't forget take a reward from Trevor Rogers. This time it's very useful Auto Rifle.
Main quest unlocked: Quarantine Zone (quest is automatically unlocked after finishing the described mission).