Shark Alley

The day starts at the Kleinbaai slipway, where operators such as Marine Dynamics and White Shark Projects load gear and run the roughly 8 km crossing to Dyer Island and Geyser Rock. Once on site the cage is lowered alongside the boat rather than dropped to the bottom, tethered so it floats with its top bars at the surface; a crew member works a bait line to draw sharks past the bars while divers breathe through a hose piped down from a surface compressor, or simply snorkel. Nobody needs a certification, a logbook, or prior diving experience — getting in the cage is closer to an aquarium exhibit worked in reverse than to a normal dive.

The channel itself sits between two small islands that nobody is allowed to land on. Dyer Island carries a declining African penguin colony, and Geyser Rock holds around 60,000 Cape fur seals, which is the reason the water here concentrated so many white sharks for so long: an ambush ground beside a standing food source. Indo-Pacific bottlenose dolphins work the same channel, and the crossing itself, not the cage, is usually the roughest part of the day.

What changed is well documented rather than guessed at. From around 2015, two male orcas with distinctive collapsed dorsal fins, nicknamed Port and Starboard for which side each fin folds toward, began hunting white sharks along this stretch of coast, flipping them belly-up to trigger a paralysed state and eating only the liver before leaving the rest of the carcass to wash ashore. A well-known 4.9 m female called Khaleesi turned up this way in 2017, and white sharks began evacuating the area for weeks at a time whenever the pair were around, sometimes for much longer.

A trip booked today is honestly a different product from one booked in 2010. Some operators have closed; the ones still running lean harder on bronze whaler (copper) sharks and broadnose sevengill cowsharks, both of which keep showing up in the channel, and treat a great white sighting as a bonus rather than a certainty. Researchers are still arguing over whether the white sharks relocated east to Algoa Bay and KwaZulu-Natal or the regional population genuinely fell — worth knowing before you book on the strength of an old dive-magazine season chart.