... where oil companies want to drill

Anchored in calm blue waters off Wedge Island Nature Reserve in the Great Australian Bight, a ship is approached by a pod of eight curious dolphins before they swim away.

One hundred metres below us, a kelp garden teems with colourful life.

Hundreds of timid blue devils with electric blue spots duck for cover in rocky crevices.

Bright red harlequin fish, known as "Chinese lanterns" because of their distinctive colour and shape, amble across the sea floor.