UnderWater World Guam

UnderWater World Guam and its collection

UnderWater World Guam, opened in 1999, is a mixed in Tamuning, United States.

It is the only oceanarium in the US territory and claims one of the longest aquarium tunnels anywhere. Much of the stock comes from the seas around the 200-square-mile island.

History

It opened in 1999 with over 2,000 animals of more than 80 species. In 2025 it shut to visitors for a large rebuild covering visitor facilities, displays and life-support systems.

Animals and collection

The main tank holds grey reef and blacktip reef sharks, a zebra shark, a green turtle and a whiptail stingray. One display holds four large moray eels, and another gallery display is devoted to fish that switch sex.

Conservation and approach

It is a major sponsor of the International Coastal Cleanup and gives free marine-life talks to schools. Discounted guided field trips are available to groups.

What the venue says

• Visitors typically spend around 45 to 60 minutes walking through the tunnel and viewing exhibits.
• Past interactive programs included daily animal feeding sessions (such as surface and in-water shark feeds) and specialized diver experiences.
• nearby public and complex parking structures
• the facility provides standard accessibility options