T'au Startide Nexus Revealed! What The Hell Is It? Let's SPECULATE!

The Warhammer 40,000 Official Facebook page has posted an interesting little image talking about the Startide Nexus, the thing that is allowing the Fifth Sphere expansion! The question is, what the hell is it? Let's have some wild speculation, shall we? Leave your guesses in the comments below! Link: https://www.facebook.com/1575682476085719/photos/a.1576243776029589.1073741828.1575682476085719/1982899995363963/?type=3&theater
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"Too Cool" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/