They mention high mercury levels as a trap or from wine that the emperor drank, but neither is likely (they often used to add lead to wine as a sweetener, but not mercury AFAIK). But, mercury contamination in tombs, especially in Asia, is very common from the heavy use of the deep red pigment cinnabar, also called vermillion, which is mercury sulfide.
Faik the worry isn't from wine the emperor drank (though I think the consensus is he did take a hell of a lot of mercury as medicine believing it'd give immortality). It's the described artistic floor map of China (at the time) with the rivers of liquid mercury suggested as being real by the high mercury readings.
Fear of damaging the tomb, as mentioned near the end (archaeology is a destructive process in many cases, and there's always new technology coming that could have told us more if we hadn't disturbed something) is definitely a thing. I also think there's a worry that it's not what they think it is and there will be great disappointment. It's not thought to have been looted in antiquity, but that also doesn't mean it wasn't.
Alright so how about we build an air tight enclosure around a small part of the door, just big enough to get, say, a small drone through. A mechanical part of this enclosure would be saws or something to breech the door. Would probably want to draw a vacuum in the enclosure first just in case.. maybe the enclosure could act as an airlock so researchers could access the drone for charging, upgrading, repairs, and whatnot?
I heard of this tomb when I was really young and ever since I've kinda used it as an engineering exercise in my head. Sometimes I draw things out for myself but this is the first time I've ever told anyone about it lol
The solution will definitely require one or several bots or drones of some sort, but even the act of getting the bot inside might trigger a trap that damages the room itself. I suppose the archeologists will eventually have to request resources to set up a combined team that involves engineers.
"The formidable and ambitious Qin Shi Huang was the first to rule a unified China, and historical reports suggest he became obsessed with drinking mercury in a misguided quest for eternal life.
He often drank wine laced with mercury and might have died of mercury poisoning at the age of 49, the BBC reported."