A must visit attraction of Singapore, Underwater world is an oceanarium that houses more than 2500 marine animals brought from different parts of the world. Situated on the offshores of Sentosa Island, the park was opened in the year 1991 and since then has been a craze amongst people of all age groups. For sighting the marine residents of the park, there is a thick glass tunnel with a travelator that covers the entire 83 m length of the tunnel. The animals that you can see here are sharks, eels, turtles, stingrays and lots of performing dolphins. You can also indulge in many adventure activities as well here like diving with the sharks and marine discovery.