How did no one find The Weapon before Master Chief?
In the Rubicon Protocol, Spartan Stone goes down the lift in outpost Tremonius which if you'll recall is the one leading to the substructure where Chief finds The Weapon and kills Tremonius in the second mission. There she fights Jega and dies, but right before that she picks up a UNSC signal, clearly The Weapon right? (or maybe Horvath since he was also underground at the time). She dies soon after so maybe she could have found her.
However, then Kovan and the boat crew retrace her steps, find her body and continue forward into the substructure but they somehow don't find her?
To be fair, they were running from the Banished so perhaps they couldn't stop for anything even if they did pick up her signal too but i wish the novel acknowledged it.
My question now is how didn't the Banished find her? My guess is that she hid from anyone without a UNSC signal and she is obviously too advanced for them to crack.