"My preciousssss"

The problem is, every warning or piece of hostile architecture reads like a challenge to any colonists that come after us.

The pyramids were believed to contain dangerous curses, and there were warnings against opening the tombs of the pharaohs, but that didn’t stop people cracking open those sealed boxes.

Your last sentence is exactly the sentiment that all those other messages are trying to avoid evoking. Now I have to explore this rabbit hole. What have you done?!‽

This place ______ a place of honor______ highly esteemed deed __ commemorated ________ valued is here.

Sign is a little worn but we have translated what we can. Those other pictures are probably just some silly Ancient American curse. They worshiped child fuckers so no reason to take them seriously.

It's really just a bunch of naval gazing.

Just carve a bunch of skulls around the entrance and call it a day.

Ok so you've warned future people about nuclear waste, now are we going to get to work on warning future people about poisonous fruits, poisonous fish, volcanoes, etc? No? Why not? Won't those kill more future people than a few idiots that decide to go exploring a cave with a bunch of skull images out front? Once a few people die from going into the skull cave, the rest of the tribe know not to go there.

We can't keep 100% of future idiots safe from everything. Why would people be so obsessed over trying to make people safe from this one particular thing when there would be hundreds of dangers a primitive tribe would have to deal with constantly?

For those privileged enough to not get this joke:

What does Claude have to do with burying nuclear waste?

It also needs to be somewhere geologically stable. You really don't want erosion cracking open the storage. That limits the options.

It's also worth noting that habitability can change remarkably rapidly. E.g. the Sahara went through a green period. It ended about 5000 years ago. The reverse can also happen.

The mindset being used is also layered defense. We need to make it simultaneously understandable, boring and off-putting. Putting it somewhere inaccessible also helps.

There is no saying that a desert will remain a desert in 10k years.

Actually.....

Actually, it might encourage them.