The National Environment Agency on 16 July 2005 officially opened Semakau Landfill to the public for selected recreational activities. It was launched by the Minister for the Environment and Water Resources, Dr Yaacob Ibrahim, with 40 families of the former residents of Pulau Sakeng, one of the small islands from which Semakau Landfill was built, invited back to their former home as guests of the event. The residents had left over 10 years earlier. The opinions of various interest groups and organisations such as Nature Society of Singapore, Sport Fishing Association (Singapore) and Wild Singapore in using Semakau Landfill for recreational purposes were sought. Currently, members of the public who wish to visit the island are advised to contact TASOS, Starfish Learning Journey, Nature Society, Sport Fishing Association, or the Raffles Museum of Biodiversity Research which conducts guided walks on the shores of Semakau for the public. All groups are led by a trained guide. This supervision is in place to protect the island's natural environment. Since 2010, the National Environment Agency took over management of guided walks on Semakau from Raffles Museum.