Day trips along the shelf

The honest answer is: a lot, if you are willing to learn to dive properly, and very little if you are not.

Reachable

Most of the upper rib of the anchorages, between thirty and sixty metres, is reachable on technical air or trimix with a competent operator. The kelp forests at fifty metres are the standard postcard view, and you will, if you are patient, see a kelp-fanwing in the half-light.

Reachable, but not as you pictured

The submersible tours to two hundred metres are real, but they are tours, not dives. You will be inside a pressure hull. You will see less than the brochures imply. This is a function of available light, not of the tour operator.

Not reachable

Anything below seven hundred metres, except by booked submersible expedition with the Conservancy or its accredited partners. The Atlas marks these clearly. Do not attempt a descent on borrowed equipment. The depth tiers are not opinions.