Enclosed environment research focuses on the study of controlled or artificial environments, such as space habitats, underwater habitats, or biospheres. This area of research examines how to create and maintain sustainable and habitable environments for humans and other organisms in isolated or extreme conditions. Researchers investigate various aspects of enclosed environments, including air circulation, water purification, waste management, food production, and human health and well-being. This research has applications for space exploration, deep-sea exploration, and sustainable living on Earth.