Give me a single example of a useful bunker in the history of war. With my modest knowdeldge, from the Maginot line to the Atlantic Wall, none. They're pretty m

Give me a single example of a useful bunker in the history of war. With my modest knowdeldge, from the Maginot line to the Atlantic Wall, none. They're pretty much like locks. Can be cracked with a cocktail of goodwill and *time*.