A reef indoors
The Giant Ocean Tank opened in 1970, a year after the aquarium itself. The cylindrical tank holds 200,000 US gallons of water and recreates a Caribbean coral reef.
Around the tank
A walkway spirals up around the tank, with 67 windows looking into the reef. At its base, African and southern rockhopper penguins live in a 150,000-gallon pool.
Myrtle and her neighbours
Among the tank’s permanent residents is Myrtle, a green sea turtle. The tank reopened in 2013 after upgrades that expanded the reef and added the Yawkey Coral Reef Center.



