DEEP-SEA DRUMMING.

On the edge of the continental shelf at the south-eastern tip of Africa, a rocky ridge rises from the ocean floor in the
murky depths some 750 m beneath the surface. Beyond this submarine feature, which is no more than 500 m wide,
300 m high and 40 km long, the shelf falls away steeply and the warm Agulhas Current rushes past. On the landward
side, the ridge forms a natural amphitheatre, and here the kingklip take ‘centre stage’, their calls booming out across
the seascape.

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