Go down there with a hunting rifle a machete, and your hit points handy capped to about 150 and tell me if its frightening, oh and no rad away or rad-x as the legion is largely ignorant of medical science they won't have any of those to spare. Only the most elite of Caesar's legion could stand up to the sentry bots and other nasties down there. And as Caesar has no idea whats down there how red faced would he be if a dozen of his best men blew themselves up? Why risk his own men when he can risk you.
Caesar want's to recruit you, so its logical the first task your given is to go down into an irradiated bunker and destroy what's down there. He knows you either came for or with the platinum chip. So he already knows the Courier has knowledge of the chip and what its for.
And maybe Caesar figures, "If the Courier is going to betray me he'll/she'll will try and kill me so it doesn't matter if that earthquake was the bunkers destruction or not."
OK, that makes sense. It's a test.
But as far as the results, I'm still confused. Since I activated the securitrons instead of blowing up the bunker, I ran out of the Legion camp without going back to Caesar. I was surprised Caesar didn't stop me, since If I was Caesar, and the courier didn't blow up the bunker, I'd kill the courier immediately. Instead, Caesar let an enemy (the courier) go free.
One other question -- how do you kill Benny, either before or after he's taken prisoner? He fled Vegas before I got to fight him, and I didn't see him in the Legion camp.
Thanks,
Wrayk