My opinion on the Great Flood is that it could have been a massive Tsunami of Humanity Destroying Proportions.
Oh. You were talking about the Ark of the Covenant? That makes more sense .
I suppose, from a POV aside from Christianity that makes sense. Although, something that emitted radiation wouldn't kill instantly, and if it had that powerful radiation a curtain won't protect the priests, would it? But I think it sounds cool. And also, it wasn't ventured close, I'm sure it was touched. People had to move it, and they used sticks to hoist it up without touching it. it had these holes or something to put sticks through and so carry it. But I wonder, what else do you think it could be? I seriously can't think of anything. Poison like the poison dart frog?