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Dunno where that picture is from, it makes it look much more like a human construction, here's a more recent pic. If you want to learn more about this rock wall, here's a link.
TL;DR It's sandstone that fractured (something sandstone does all the time) but happened to fracture into a pattern that looks like stacked stones. This apparently happens a lot to rock that is underground and while there were legends of arches and hallways and even "metal tools" there is no actual evidence to say those existed and the "metal tools" where simply iron deposit in the earth which happens all the time.
Stone can even form hexagonal pillars/ patterns. I don't know why people are surprised. It's called columnar jointing (for my example).
Just because you name it, doesn't make it natural. That was obviously built and put in place by some sort of alien Q*Bert type species.
Had me in the first half
And you should have heard the swearing every time something went wrong!
I'm going to censor the word they say because it's really bad.
spoiler
"@!#?@!"
Hexagons are the bestagons.
CGP Grey started a cult similar to Pythagoras'es. Convince me, I'm wrong.
It's not so much that they're surprised, it's that they won't accept prosaic explanations when there are more interesting fantastical ones.
No no no. You don't understand. What that means is that aliens are actually hexagonal and they're just sending a message that they are that shape. For some reason.