 In 2001, French geographer Christian Jost extended the 1997 studies through his French "Passion 2001" expedition, explaining the evolution of the ecosystem, and releasing several papers, a video film, and a website.In 2003 Lance Milbrand stayed for 41 days on a National Geographic Society expedition, recording his adventure in video, photos, and a written diary (see links below).In 2005, the ecosystem was extensively studied for four months by a scientific mission organized by Jean-Louis Étienne, which made a complete inventory of mineral, plant, and animal species, studied algae as deep as 100 m (330 ft) below sea level, and examined the effects of pollution.