This strap-on booster is a complete liquid fuel rocket engine. It has incredibly sophisticated turbine pumps, multiple types of alloy for tubing and fuel lines, and most of the stuff that takes heat like the nozzle, combustion chamber and fuel circulation tubing is going to be a titanium alloy, but mostly titanium. Yeah, it is amazing to see it crash so intact. It is something to wonder if there was a salvage effort all these years.