Our friends at Oobject have assembled 12 of the toughest examples of deep-sea diving suits around—from da Vinci’s cloth prototypes to the bell helmets made famous by countless Scooby-Doo villains.

Polygon’s Animal Crossing sea creatures list helps you complete the aquatic section of the museum along with a Wet Suit, ocean, and some new ACNH sea creatures.

The suit itself costs $600,000, which doesn’t include all the support equipment. It’ll be tested as a scientific tool this July in canyons about 100 miles off the New England coast.