A good little film, a bit dry in areas, but some nice locations and a great cast of people. Certainly worth a watch if you enjoy exploring.
Only criticism, is they clearly played it safe, sticking to the same formula almost every UE documentary has done for the past decade. It felt almost like an update copy of Into The Darkness. That's a shame as it seems they got a fair bit of money to fund the project, they could have gone somewhere truly unique or tried something new. But hey, I guess that's personal preference