What would they do with a crashed UFO?

Apologies if they has been discussed before. But i was thinking about this the other day, what would the scientist and engineers do once they have a recovered UFO thats already safely placed in a bunker? Im not an engineer anything so what is the official procedure for reverse engineering technology, terrestrial or otherwise? Do they rip it appart right away to see how it ticks or is that discorged as it might destory any working equipment that might still be intact? Anyway thanks for any response you can give.

It would depend upon the philosophy of whomever was in charge of the project, and what technologies were available at the time.

In recent times, the need for better aircraft maintenance has lead to a number of technologies that allow us to analyze the composite structures of an air frame to determine whether or not they require replacement - and do not require any destruction of the air frame to do the analysis (essentially, a "scanner").

In modern times, we'd use many nondestructive technologies to cause as little disruption to the structure and technology onboard.

Though for some things, like materials (hull structure), some of them would have to be sacrificed (a few miligrams - not much) for spectral analysis.

In essence - it would be little different than if you were an amateur electronics person taking apart a high-dollar radio to see how it works. You would start out touching as little as possible, making sure not to do any damage - and then you would start probing around with meters, and you may eventually get around to popping open a 'chip' to see what is inside.