I didn't mean to downplay the difficulty. I understand that despite marked/un-marked choice it's still very difficult engineering problem, but from the cultural

I didn't mean to downplay the difficulty. I understand that despite marked/un-marked choice it's still very difficult engineering problem, but from the cultural point of view, I believe, it's safer to keep such things hidden away as possible and un-marked to avoid any attention than to hope that the future civilizations will take our advice to stay away.