Ushgarak was hiding in a small niche as he waited for the guards to go past.
Once they had gone by, he dropped out and headed towards the power coupling. Taking out a small tool kit from his belt, he soon undid the binders and accessed the energy flow control. He looked around once more to check if anyone was near, and then he started to interfere woith the power flow, causing it to swell and shrink in rapid succession.
This place was to deep underground for those on the surface to detect its normal power emissions, but if Ushgarak could keep them fluctuating like this then it might jut be detected by someone up top...