Talk with Marvin | Chapter 7 - Terminal Siege DI Riptide Guide
Last update: 11 May 2016
BEFORE you talk with Marvin, do all regular activities concerning this type of missions. Your number one priority is setting up fences.
The second important thing is to plant every mine you can around the Ferry Station. As during the quest in Jesuit Mission, set them next to the entrances to the camp.
At the very end care about your weapons and buy ammo. After that go and talk with Marvin. HE launches engines, what attracts a new Horde.