"An analysis of the likely number of deaths over 10,000 years due to inadvertent intrusion should be conducted. This cost should be weighted against that of the marker system."
A practical consideration. If you spend human life time on efforts to prevent loss of human life, you risk a net loss if you don't trade the cost against the benefit.
Or just leave it unmarked and hope the pile of remains outside the entryway gives the next adventurer a hint.
And then just accept human nature and let the pile slowly grow.