Spacetime manipulation vs a fall.

[dendros]

Let's imagine a scifi scenario in which a space vessel is falling on a planet due to a degraded state but remains functional enough to create an emergency warp bubble as a shield, basically the bubble makes the geometry of the vessel unchangeable in order to survive the impact. In other words, the local spacetime region around the vessel becomes "rigid".
Let's also say the vessel is made from a metal with tungsten-like density and it's a sphere with a diameter of 4 km, hollow inside with the shell 160 m thick. The speed of the fall is about 20 km/s.
What would happen at impact?

 

[.Scott]

Anything you want. The Physics is all yours. It isn't real Physics.
But you may want to make yourself (and any other occupants) similarly "unchangeable" or else the high G's on impact will leave you unpleasantly "changed".

 

[dendros]

Of course this is fiction but I want to give it at least a semblance of realism.
The high G's are not a problem, inside the sphere are dampening fields.
The vessel is quite advanced, it has a warp core, onboard fabricators (they're not like star trek replicators, rather they convert matter into any other matter), advanced sensors that can perceive spacetime directly in addition to standard sensing, life-preserving modules, advanced AI.
What I'm trying to imagine is how would the impact look like for an outside observer, so to speak. The planet in this scenario is uninhabited.

 

[Matterwave]

I might just point out that for me as a reader and general enjoyer of physics, the two parts of your two posts that seem most implausible to me are that "spacetime becomes rigid" and "perceive spacetime directly".

Spacetime is not a "thing" which I would generally describe as capable of the adjectives "rigid" and "detectable".

That being said, you are indeed free to write the physics however you like! :)

 

[dendros]

@Matterwave, notice the quotes around "rigid". Basically I'm saying the warp bubble preserves the geometry enclosed by it, in that sense it becomes "rigid". This means deformations are effectively forbidden.
The vessel is basically an advanced alcubierre drive.