Elite: Dangerous - Accessing The Engineers, Meta-Alloys, Soontil Relics and Horsehead Locked?

I take a look at the requirements to gain access to the intial three new Engineers in the latest update. I also discover something strange going on in Barnards Loop.\r
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Barnacle Location: Merope 5 C - Coordinates: -026.3496 -156.4044\r
Other Barnacle Locations: \r
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Soontil Relics: Found in Ngurii