Had two left over from another guest. Realised as all the mechs were asleep and my pawn had invisibilty, we could sneak in and place a couple. Then wait for them to wake and wipe themselves out. Annoyingly, this would of been clean but I got hit with a mech attack just before.
Oh and the fact they had a few unstable power cells helped create a chain reaction.
![](https://s2.save4k.ru/pic/vRE7M0mHATk/maxresdefault.jpg)