Strong currents surge through the narrow entrance to Seymour Inlet.

In the middle of the Inlet stands the small Tremble Island (also known as Turret Rock), so called because it's said to shake at peak tides, when the current races past at an overpowering 16-20 knots.

One story tells of how an early land surveyor chose to stay on Tremble Island during a strong tide, but the island vibrated so violently that he was forced to lie face down, clinging to the roots of small bushes, and stuff grass into his ears to block out the noise.

The island's trees are covered in numerous signs, left by the crews of ships that were trying to get in and out and had to wait for the tides. Some of the signs date back over 100 years.

A dive here, on the right day, allows you to view the most amazing crimson coloured goose neck barnacles.