It's never been stated they can survive nuclear bomb's. Also Spartan fours in Gen 2 armor were said to be equal to Spartan twos in Mark six armor. Of whom were almost killed by a fuel rod canon. "When she turned to let off a few bursts in the hunter's direction, the emerald discharge from an assault cannon slammed right into her chest with a deafening roar of static, lifting her off her feet and slamming her onto the ground. Getting knocked over saved her life, for as she thudded onto her back a second green ray of incendiary plasma blasted directly overhead. With her shields completely knocked out and the HUD shield alert honking a furious warning at her, the second blast would have cut her in half." Halo: Evolutions Vol. II "Blunt Instruments", page 28.

I swear it's been stated I have to look for it. After all chief survived it. Then again it is a video game and logic doesn't always have to make sense.

Cortana protected him, if 343 said otherwise I will be shocked, because that breaks the entire the entire setting.

I just explained it but I guess nvm then.

If you find the link can you give it to me so I can see? Heh, I'm the 117th post.

Lol. And I'll try to pull it up somewhere.

Ok thank you.