User blog comment:IamJakuhoRaikoben/Chapter 389: The Twin Dragons vs. The King of Hades, Review./@comment-24800928-20140621025533/@comment-7418318-20140621085656

There would have been an easy way to activate them all:

There is one master-controll unit or control room or something from where you can activate them all, but Tartaros didn't know where that is, so they settled for activating one manually and see if that might start a cascade that sets the others off.

If it does, great the plan is finished and if not, oh well, lets keep searching.