W, E, 3, M so what is it?

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So I was building a Google Map today and came across this via the satellite view. What is this? A set of containers? Buildings? And did they put them this way on purpose to spell out a letter or number? And if so what?

Zoom out with the minus-sign to see where it is on the slopes of Mauna Loa. If you grab the map and move around the surrounding area you’ll find all kind of other stuff. Military? Science stuff? Future resorts?

19º 36.934'N, 155º 36.788'W Elevation: 7,547 feet
19º 36.934'N, 155º 36.788'W Elevation: 7,547 feet

Above a a screen snapshot from the Google Earth view. To view in Google Earth you can get the .kmz file by clicking on this and opening the file with Google Earth. (you may have to right-click save): we3m.kmz

From the scale on Google Maps the height of the ‘E’ is 200 feet which would make each one of the white objects 25 feet in length.