Right! Where the probes transmit to and the content it is transmitting are two different things. That would be like me turning to talk to a person, about the person to whom I'm speaking. There's very little context about that, unless we're discussing a bad decision that person made, or it is a self-help session. Indeed...I have no idea what the encoded messages are about, so I trust other's opinions or facts on that matter. I'm just more interested in where the transmissions are being sent to. The probes pointing to Merope while sending these messages, off system and point to 5C, when in system. I can only surmise it's either underground, or a listening post in low orbit over the system, which is, so far, not found.Merope ... 5c... crater...
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jokes aside, the spectrogram within the thargoid probe audio does not reference 5c directly, it just hints at how the signal was to be interpreted. The spectrogram within the thargoid link audio, otoh, depicts Merope as a system but has nothing particular pointing to 5 c.
I can't remember exactly now, but I think the only in-game references to thargoid motherships are in one of INRA base and in JJ's logs