Choir Reef

What it looks like, and what it does

A shallow bay at low tide. A reef of pale calcified pipes rising in ranks like a cathedral organ, taller than a house, the sea breathing through them. Fishing boats at a respectful distance.

Silent in a flat calm. Speaks with the swell and the wind. Loudest on the ebb.

What is known

Cantor's Shoal was charted in 1802 as a hazard. It was a reef of tubes even then. Fishermen say it sings the weather.

Scientists have recorded intervals of just intonation across its whole range. It adds a rank of pipes every decade.

What it can do

• Sounds chords in just intonation as the sea passes through it
• Grows pipes in ranks, adding a rank each decade

Where it stops

• Silent in a flat calm
• Cannot be played by any means other than the sea

An encounter

Okonkwo anchored at the edge of the reef with a hydrophone and wrote that the first chord reached her feet through the hull. Nine boats had come to sit quietly and listen. She switched off the recorder. “One should sometimes let a thing be heard,” she wrote.

Adaeze Okonkwo, marine biologist, Cantor's Shoal, The ebb, early morning

What is established, and what is only said

• established: Hydrophone logs since 1964 show a continuous harmonic structure with no repeats.
• rumor: That the piece has an ending and the fishermen have been told.
• interpretation: It may be a reef that sings. It may be a score the sea is using to learn.

Still unresolved

The chords, mapped over sixty years, repeat as one very long piece. It is about two-thirds finished.

Where it has been recorded

• Cantor's Shoal (confirmed) — Recorded by Adaeze Okonkwo, marine biologist.

Connected entities

• The Cistern Whale — Both are enormous things heard through water that no one commissioned. People come to listen. Neither stops.