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In pictures: South African innovators
Taming waves

Dolos are unusually shaped concrete block weighing up to 20 tons used to protect harbour walls from the force of the sea.

They work by dissipating, rather than blocking, the energy of waves.

In 1966 Aubrey Kruger came up with the original dolos design, but as the breakwater device was never patented, it has been copied all over the world.

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