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I only watched the first few, is it a straight down pit?
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Yes and no, as you can see from facemasks, facial blurring, the fact that all excavation activities are done within the envelope of the building, and the youtube account obviously created for the sole purpose of posting only these videos these guys take OPSEC and PERSEC serious.
At some point around video 4 or so you will see 3 large precast concrete pieces lowered into the shaft and set to make the start of a horizontal shaft or doorway before the vertical shaft is back filled with concrete. At one point near the end you will see a guy descend the shaft and disappear into that horizontal shaft or doorway. However, they never show what lies beyond the vertical shaft.
I wish they had shown construction of the horizontal shaft because I feel like that is one of the more difficult aspects and there was much to be learned from that.
The further you get in the series the more you will learn that while these guys are certainly limited on tools and such, they aren't just hacks. They are smart and every detail of this build was planned in detail.