after the ending i started back in the beginning and Ciff Clothes are damaged soooooo What Happened

Just looking for some simple fun.

where is dead island 2 ?

So on my way to the heli pad I decided to climb down one of those hatches. I mean got a flash light. It's here. I've seen at least one prior. . . It's been at least 10 minutes of exploring and a door shut behind me. It won't open. I killed the first Dweller, the two Spitters in the dark, and now there's a second Dweller. 20 pistol rounds, an axe, and the camera If I keep going does it lead anywhere?...

i need help if i cant find it i wont be going further into the story