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A group of tabletop vitrines in the show offers views of strange, sculpted, subaquatic splendor — luminous cast-glass mushrooms, sea anemones, bright ribbons of kelp.

When subaquatic grasses are least threatened, we can allow for intentional discharge that removes sediment.

Their numbers are confirmed by subaquatic listening devices that graph the squeaks and squeals the animals make, even as visual sighting become rare.

The accident unleashed a subaquatic fireball that appeared to boil the waters of the Gulf of Mexico, and drew a hail of criticism from environmentalists.

The larger story is the spread of greater Amazonia, the millions of square feet of new space that is the subaquatic iceberg floating under the Helix’s crystal tip.