The deepest bunker of them all

[someone_else]

As for digging out of the bunker, you can always use a subterrene, nuclear or fusion or fart-powered as you wish.

What about a big hot air zeppelin. In a gas giant. Never gonna find you. None ever pulled off a BDZ on a gas giant.

[Purple]

Well, I guess it's time to bring out the details.

The setting is a collaboration between me and several others, each with their own distinct view of how it works. As such, weapons tend to range from single digit gigaton nuclear devices to laser beams and plasma charges that work like giant shaped charges vaporising the insides of starships (ouch). Speeds in the universe are really fast, so fast in fact that the only limit to what speeds our starships battle at is time dilation and several factions have built devices to counter its effects so that they can go even faster. So our inertial compensation technology is immensely powerful and prolific. Planetary devastation can happen, but it is not nearly as energetic as a BDZ operation. As in, there is no melting of the crust and volcanic ruptures down to the core. But it does include idiotic tonnages of nukes being thrown around. The above mentioned 200GT per square km would not at all be unexpected or unusual. One of my destroyers (small patrol warship) can dish out about 600GT per minute worth of missiles for several hours sustained. We have cloaking technology, but it is neither like it's star wars or star trek counterparts. Being cloaked does not make you blind nor does it prevent you from using your weapons, shields or FTL drives. However, firing your weapons or using active sensors will give you away to the enemy. After all, the cloak does not hide your beams or missiles.

As for the bunker it self, the bunker would definitively be a secret. Or rather, the very notion of such a bunker existing would. So I doubt that the enemy would be actively targeting it. That in part would be its strength as I expect the enemy to expect me to do what you said and just build a cloaked starbase somewhere. I will definitively put it somewhere god knows where connected by a supersonic train thou (great idea, thanks).

[Imperial528]

Purple, you might as well bury one of your mega-ships in your homeworld or something at this point. And I think you know what ship I'm talking about.

Failing that, here's what I think you should do:

First, find a suitable location for your bunker, like a desert or tundra, although a mountain would work, only it would be a bit harder to execute and take longer to do.

Start by digging a cylindrical hole with a diameter of 500m and to a depth of 500km. Then dig a hole from the base of that which tapers down to a diameter of 50m. Begin building the bunker's structure to match the shape of the taper to the required armor thickness and necessary structural members. Then fill the bunker with systems, escape engines at the bottom of the cone, with living quarters, life support, and other essential systems in the middle. For the top of it, construct a 250m radius half-sphere with much a thicker hull. The half-sphere will contain two important systems: primary reactor, and shield generators. Additionally, you can place weapons on it if you wish, but remember that energy used to power weapons could instead be used to power shielding. When both sections are done, lower the top section onto the bottom (or just build it on top of it, it depends on the design) and fill in the remaining 250m hole with the same dirt you dug out of it, and shape it to match the previous terrain, with the exception of a few discrete tunnels leading out of airlocks.

Essentially, this gives you a bunker and escape ship all in one, with a low target profile from orbit, and, being a starship, it should survive bombardment intact, especially if put in an area that is likely to not suffer the worst of the attack.

[LaCroix]

Wouldn't such a massive installation like the huge ship you calculated with all that armour plating cause problems for the planet's rotation? I'd think this might cause a non-negligible wobble.

[Imperial528]

Not really, even if it were a rectangular prism it would only have a volume of 75,000 cubic meters. I just noticed the typo though, that should be 500m, not km. Also, the cone is at a depth of 1000m from top to bottom.

[LaCroix]

I reffered to this one:

Alright, plan B than. I will post a short description of what I made up based on your input so far and you tell me how you think it will perform.

The bunker is a massive self contained entity buried about 10-12 kilometers under the surface. It's protection include heavy duty shielding and about 80% of said dept (in all directions) being filled not by dirt and rock but by SW style armoring materials. The bunker has complete internal life support in the form of an internal minimal ecosystem (trees and a lake) to produce oxygen and a massive power generator to supply cooling and power to the shields and run emergency oxygen recycling plants. The internal space is several kilometers wide in all directions and almost a kilometer tall.

How does that sound?

Like you need internal dampeners something fierce. Also it's going to sink. You can't put a super massive giant egg into the ear and not expect it to sink. In fact at that depth the constant interaction between the water table flash into steam is going to very quickly(In weeks) weaken the surrounding rock and your entire bunker is going to start listing. Made worse by the super dense and super heavy SW style shielding materials. Before you bunker is even done being constructed it's going to start sinking like a brick. Trying to do some back of the napkin calculations that results in a weight over over 94,164,000,000 kilograms or over 103 million tons if you were using something as heavy as steel (And SW materials weigh more) and that's only back of the napkin, going with your predicted armoring value ups that by three full magnitudes or over ninety billion plus tons worth of armoring contained in one area. And I might be off by as much as 2000% depending on the materials used and the internal construction of the bunker.

What's going to happen is your bunker is going to break up the surrounding rock and sink before it's even constructed or within a week or two assuming a standard earth gravity.