Based

>>14568532
The Castle Brians in Mechwarrior may count.

Even after the Amaris Coup, many of them remain secure facilities on the planets where they still exist.

>>14568562
>mechwarrior
Kill yourself, freebirth.

>>14568576
Fine; Battletech, you Stravag.

Fortresses haven't really been a good idea since the invention of gunpowder, and even before then, enduring a siege was a lousing proposition. And that's not even getting into the fact that many mecha settings have super-weapons that can vaporize entire mountains.

"Wait for an allied army to save us" has always been the only real hope for a fortress.

>>14568532
Iserlohn Fortress?

>>14568663
Bases still exist in the real world. Some facilities just don't movie and the only thing to do about it is throw up some walls and guns.

Even though we don't have impenetrable fortresses anymore, we still have places where the army expects to be attacked and is (in theory) ready for it. Yet in sci-fi stories we consistently have bases where the enemy shows up and they go, "Wait, what!? The enemy! Fire our two guns!" and then get killed horribly because this place that was supposedly prepared for an attack is hilariously undergunned and undermanned for actually facing one.

Babylon 5 and Deep Space 9 don't do to badly for bases that aren't 100% military.

>>14568808
Babylon 5 is an O'Neil Cylinder with the armament of several capital ships. It fucks shit up.

>>14568532
Fortress Maximus, and Metroplex.

>>14568532
Jaburo.
Iserlohn.
Ebaq 9 in Star Wars.
Some of the fortifications established throughout history in Lord of the Sands of Time.

Defenses are there to discourage an attack. If someone is attacking it is reasonable to assume they think they can win.

>>14568899
Jaburo would have fallen if it wasn't for Katz, Letz, and Kika inadvertently alerting Amuro to Char's amphibious attack.

>>14568742
Correction: we have NEVER had impenetrable bases.
All the most famous stories about battles involving bases are of them falling.

This is because the purpose of a base isn't necessarily to survive an attack. The purpose is to store and resupply arms, to serve as a logistical outpost. The defensive structures exist to make it HARDER to blow those supplies up, but repelling at attack isn't the primary goal. Because it's impossible to construct a perfect defense (barring any scifi shenanigans like flawless energy barriers).

Assuming your opponent isn't a complete fuckwit, he's going to have at least an IDEA of how difficult taking your base will be.
If he is a fuckwit, he might go ahead and attack your base, and bloody his forces nose against your walls. He might even stick around long enough to exhaust his own forces, if he vastly overestimates himself.

But a far more likely outcome is that a savvy opponent will either stay away from a well defended base, or only attack it if he has some ace up his sleeve (gunpower to destroy the huge walls, for example) or has the ability to exhaust your supplies and prevent you from resupply (blockade and starve 'em out strategy).


tl;dr - the reason you don't see a lot of well defended bases repelling attacks in fiction is because that shit don't real.

>>14568928
>All the most famous stories about battles involving bases are of them falling.
But those stories are famous because that's a rare and dramatic event. Nobody cares about all of the times that Constantinople repelled invaders because that's what Constantinople usually does. It's the one time when the other side wins that's interesting.

>>14568684
Yeah, I was gonna say that. Yang captures it through trickery, but after he does, the Empire never manages to get it back, and they try pretty hard too.

>>14568532
OP, I'm not sure if you've thought about this very hard.

If the attacker didn't have a reasonable expectation of defeating the fortress and the forces defending it, why would they attack it at all?

The fortress is only ever going to come under attack when the attacker has the resources necessary (or that they believe to be necessary) to take it. This being the case you'd expect the defense to fail almost every time, except for cases when the attacker underestimates the strength of the fortifications or defending forces.

>>14568944
Historically, it's also because the attacking force is basically never routed.
The result is usually, "Ah, shit. This isn't working. Let's go home."

It's not only a bad military decision, but it makes for a boring story.

>>14568974
>except for cases when the attacker underestimates the strength of the fortifications or defending forces.

And here we have arrived at the premise of the majority of mecha shows from the 1970s. Robot monster attacks laboratory fortress, super robot repels robot monster, rinse and repeat ad infinitum