Channel Islands

Diving here is a boat day from the mainland: an early departure from one of the Santa Barbara Channel harbours, a crossing of an hour or more, then three or four dives while the skipper shifts anchorage between coves as the wind changes. Anacapa and Santa Cruz sit within comfortable day-trip range. Santa Rosa and San Miguel usually need an overnight or multi-day charter, and those trips get cancelled or rerouted often enough that flexibility has to be part of the plan.

Underwater the structure is rock and kelp rather than reef. Giant kelp grows from boulder bottoms all the way to a surface canopy, so dives are as vertical as they are horizontal: you drop through the stalks, work the reef below, then push back up through the canopy at the line. Sheltered coves are shallow and gentle; the exposed pinnacles off the western end of the chain sit in colder, faster water and carry denser growth on every surface, which is why boats push for them when weather allows.

The appeal splits between wildlife and close-focus work. Sea lion rookeries make for shallow, fast, noisy dives, with young animals running circuits around divers and losing interest the moment you stop reacting. Away from the colonies the diving rewards patience: nudibranchs and invertebrate cover on the rock, octopus tucked into ledges, and the shallow debris fields left by a long wrecking history, among them the gold-rush steamer Winfield Scott, lost on Anacapa in 1853. For many photographers the kelp itself is the subject.

This is committed cold-water diving. Water runs roughly 12-19°C through the year, hood and gloves are standard, and surface intervals are spent on an open deck in the wind. It suits divers who enjoy technique, meaning kelp navigation, anchor-line work and buoyancy in surge, and who accept that a booked trip can be blown out. A network of state marine reserves covers parts of the islands and wreck sites carry their own protections, so what may be taken or touched varies from cove to cove. Visibility swings from a few metres to around 20 depending on swell and how recently it has blown.