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Had you listened young man you would know that those 10 holes are fro the southern section of Reef 1.
The ET was only from the northern section which had been drilled more extensively.
Reef 1 itself runs for 16km...

And here's some food for thought for anyone who has bothered to read to here:
Reef 1 (Crius/Oceanus) were originally considered to be 2 reefs as they dipped under shallow cover for about 2km.
I was looking at the map during the Zoom & noticed something similar with Reefs 2 & 4 (Hyperion/Helios) - could they also be just one reef?

Massive story unfolding before our eyes.