Extend the Story - Add a Room

You sit down, and think it over for a while. You look up, and someone is smiling at you.
"Good," He says, "You've down what every spy would've done: Think and then realize to combine the two choices."
You nod, and follow the other spies to the real camp. You are told you can choose one of two missions: Sneak a special type of energy drainer behind enemy lines and into their water supply. Or, you can sneak into the enemy headquarters, and steal the enemy plans.
Which is your choice of mission?

Take their plans