Introduction

Nazi Megastructures is a documentary television series appearing on the National Geographic Channel and a spinoff of the broader Megastructures television series.
The series also aired as Nazi Mega Weapons under PBS in the US.
Outline of Series 01, Episode 02
Examine the impenetrable submarine pens the Nazis built to protect U-boats from Allied attacks. Such was their size and strength that these pens survive today, a testament to their engineering.
Nazi Megastructures Series
A full index of the Nazi Megastructures series can be found here.
Production & Filming Details
- Release Date: 27 July 2013 (US).
- Running Time: 60 minutes.
- Country: US.
- Language: English.
YouTube Link