Why bother? It's not like they actually have even the slightest clue where I am. They're not going to do any harm to the already-found artifacts around here.
Unfortunately we have no clue where an alien civilization might be located, and what distances its transmissions must cover before being received on Earth.
It is to amuse myself that I dwell on such subjects as the lack of external comforts: they never occupy my thoughts, except at the moment when I miss them.
Those bosses who made money here on the one hand chuckle to themselves and feel sorry and pitiful for those CEOS who are still hesitating and reluctant to make dicisions.
These structures are called Passage Graves, because the inner chamber, sometimes several chambers in fact, could only be entered from the outside through a narrow passageway.