Located on Sentosa Island, the Underwater World in Singapore offers a memorable day out for the entire family. Opened in 1991, this modern attraction provides a fascinating outing where visitors can view around 2,500 different marine species of all shapes, sizes and colours. Home to a breathtaking moving travelator that spans a length of about 83 metres, Underwater World also has such unique activities as diving with sharks, swim with the dolphins programme and even fish reflexology! Offering some of the best hotel deals Singapore, Millennium & Copthorne Hotels Singapore has a range of hotels. Ideal for those in search of a luxury hotel Singapore, these properties provide the very best in comfort and convenience.