The antonyms for "opened into" are words such as "closed off," "blocked," "obstructed," "sealed," or "shut." These words describe situations in which an entrance or passage is not available or accessible, preventing things from passing through or entering. For instance, an access road may be closed off and sealed, preventing drivers from entering a construction site. Similarly, a door may be obstructed or shut, preventing people from entering a room or building. In contrast with "opened into," these antonyms suggest barriers or limitations that prevent movement or access, making it difficult or impossible for things to pass through or enter.