2-A complex network of tunnels is a system of

interconnected tunnels used for various purposes, such as transportation or sewage, and is characterized by intricate designs that include intersections and varying dimensions.

3-The word means "alleged" or "claimed," and it is used to describe something or an event that is claimed to have happened or exists without certainty or strong evidence to support it. For example, "the alleged story" means a story that is claimed to have happened, but it might not be certain or prove.

4-"Lurking" means staying hidden or waiting in a concealed position, often with a sense of secrecy or danger. It can also refer to someone being present in a place (especially online) without actively participating, like reading messages in a chat without responding.

Strange lights, mysterious entities, and alien attacks!: America's strangest and least-known