Question about The Animatrix (something's been bugging me)

[Groo The Perverted]

I remember seeing The Animatrix and wondering something. During the Flight of Osiriis, the ship found out that there was a TON of sentinels 4 kilometers above Zion. They were found out and they took off on the run from the sentinels while the one woman was in the matrix trying to deliver a message.

They couldn't set off the EMP until she was back otherwise it would have left her dead in the Matrix.

My question is this, and no one has ever really answered me when I've asked people before.

Why did they not just dive bomb into the middle of all those sentinels and set off the EMP?

That would have disabled most if not all of the Sentinels, and it was 4 kilometers up so I wouldn't think the EMP would mess up the stuff in Zion.

Always was bugged by that.