Moon-walker claims alien contact cover-up

[glatt]

When explorers in the past traveled around the world and came across new people less advanced than they were, did they hide themselves and try to do it in a sneaky way? Or did they make no attempt to hide themselves and in fact try to make contact, trade, get information, etc.?

Seems like if advanced life forms visited the Earth, they would be obvious about it. Like us lobbing rovers at Mars.