That’s the tailfin. The non pressurized bit, iirc.

The cylinder in which porky and pals sat was the center segment that imploded and shattered. The hemispherical end cap (not pictured) and tail portion which held the support hardware (shown in the screencap) were bolted to either end of the deathtube.

This bit wasn’t the problem though. It looks like the tail cone which isn’t pressurized. There’s the end caps and carbon tube which had to take pressure and it’s the tube that got imploded.

paying respects