Spoiler: Destro and Haval
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"Found it," Hannabel reports. "No sign of any hostiles, which is consistent with the pict-recordings from the time of the transmission. Everything points to the transmitters having been placed beforehand and probably activating automatically, so no need for any conspirator to risk getting caught sending a message."

"This one's been spliced into a conduit and the auspex is detecting combustible materials inside the transmitter case. Probably booby trapped to prevent tampering and destroy evidence. Do we have any explosives experts on board?" she mutters into the micro-bead.