Europe after the Icecaps melted

Over a millennium ago, the earth was practically destroyed, and not many people were left.
To make sure no one followed, and hoping that Earth would repair itself, the last group of astronauts launched bombs above the earth that fried all electric devices and put civilization back to the dark ages.
People have reformed society in many different ways.
It is about these people this story is told.

Harbour Cities I – Midland
Harbour Cities II- Perris