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MaST Center's Discovery Day

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Located on Redondo Beach in Des Moines, Highline College's Marine Science and Technology (MaST) Center is home to thousands of native Pacific Northwest Marine creatures and plants, has four skeletons on display including a 38' gray which died in West Seattle in 2010, and 15 tanks including two touch tanks. Come spend an hour or two with the crabs, fishes, and octopus.

The MaST Center is open for public viewing Saturdays from 10 a.m. – 2 p.m.

See our aquarium that holds 3,000 gallons of seawater
View 250+ native Puget Sound species
Experience 2 large touch tanks
See our 38 foot Gray Whale skeleton and other marine mammal skeletons
Learn about current issues in the marine ecosystem of Puget Sound

Note: At this time, visitors are required to show proof of COVID-19 vaccination or negative test to enter. This does not apply to children under 12. This is a requirement of King County Public Health; visit for more information. Please be kind to staff enforcing this regulation.

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