Poor wording. It is not that using wing tunnel pressure to pump water is space tech. But that only seen from space they could map it to the civilization for con

Poor wording. It is not that using wing tunnel pressure to pump water is space tech. But that only seen from space they could map it to the civilization for context. If tomorrow all humans and humans artifacts disappear except the great china wall, an alien will be very confused why it exists, not how it was built.