It takes an experienced deep-water diver like Hamish Tweed to reach most of the glass sponge reefs.

You have to descend more than 60 metres into the depths of B.C.’s Howe Sound where, even in the middle of the day, you’re sinking into total darkness.

Tweed has seen plenty of glass sponges in his years diving off of the province’s South Coast, but those were individual animals; the enormous reefs are different. He still remembers the date of his first visit to one of them: Feb. 23, 2013, a Saturday.

When the diver’s underwater light hits the magnificent, alien reef, its scale comes…



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