context-
These really are the only two relevant images I could find about this project, but there is some infos about it, the Midgard serpent was proposed in the summer of 1934 and was intended to destroy the Maginot line as well to attack different important facilities like ports and naval bases in countries such as France, Belgium, and the UK.
The design was very versatile and can move on land, underground and underwater. This thing was supposed to reach 30 km/h on the ground and the maximum length being 500 meters with 30 crews managing it.
To move underground this behemoth was to be armed with 4 drills and to be powered with 9 electric motors, this thing can also be armed with 12 coaxial machine guns
would probably be interesting if this was in game 
