I wonder how those faired in combatI think the Soviet Teletank deserves further attention - to say it was built by a state whose war policy allegedly involved drowning the enemy in bodies, it seems rather forward-thinking...
I remember reading about a gigantic 'worm like' digger that was supposed to dig a tunnel under the Maginot-line.
Or then I just made that up.
I guess if it flies it can beat this:
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Now that is what I had in mind when I started this thread. Not some mickey mouse I-400 or Surcouf. Are you sure it can't fly?