The hull consisted of a carbon fiber tube with titanium endcaps, one of which served as a door (which could not be opened from inside) and contained the porthole.
I watched this that shows the making of the hull. So it seems that it’s carbon fibre over a metal cylinder. I don’t know if that cylinder is titanium but it doesn’t seem like the hull was pure carbon fibre. That cylinder is nowhere near thick enough for anything but the base for the carbon fibre though so it’s not like it would offer anything but squish in an emergency. But I did find this very interesting (and terrifying somehow):
The hull consisted of a carbon fiber tube with titanium endcaps, one of which served as a door (which could not be opened from inside) and contained the porthole.
I watched this that shows the making of the hull. So it seems that it’s carbon fibre over a metal cylinder. I don’t know if that cylinder is titanium but it doesn’t seem like the hull was pure carbon fibre. That cylinder is nowhere near thick enough for anything but the base for the carbon fibre though so it’s not like it would offer anything but squish in an emergency. But I did find this very interesting (and terrifying somehow):
https://youtu.be/4O5F4ZVlIac?t=660