Diving the Cape Peninsula and False Bay/Kanobi's Wall

The dive site Kanobi's Wall is an offshore rocky reef in the Karbonkelberg headland area on the Atlantic seaboard of the Cape Peninsula, near Cape Town in the Western Cape province of South Africa.

Understand

This is a good site for rugged topography, biodiversity and depth range.

Position

Kanobi's Wall 📍: S34°02.365’ E018°18.138’ — The blinder just south of the rock furthest off Duiker Point which extends above sea level.

This site is in the Table Mountain National Park Marine Protected Area since 2004. A permit is required. The site is inside the Karbonkelberg Restricted Area.

Name

This blinder off Duiker Point was named "Kanobi’s Wall" by Odette from Pisces Diving in 2005. It has been speculated that this may have some connection with the character Obi wan Kenobi in the Star Wars movies, but this has not been confirmed. The reef to the south was named Star Walls following this example. Kanobi's wall is also referred to as Kanobi's Reef, as the wall is not such a distinctive feature.

Depth

Maximum depth is about 25 m, and the reef breaks the surface at one place.

Topography

Relief above 18 m is quite spectacular. Huge stacked boulders, with tunnels, overhangs and caves of various sizes, and lots of vertical walls, some probably 10m or more in height. Deep narrow gaps and crevices. No sand seen. A knocking sound suggests a loose boulder somewhere, which is moved by the surge. There is a small cave at S34°02.358’ E018°18.103’, a low, wide cave at S34°02.347, E018°18.102’, 19 m deep, and a swim-through from S34°02.349’ E018°18.116’, 13 m deep to S34°02.358’ E018°18.125’, 13 m deep.

Geology: Granite of the late Pre-Cambrian Peninsula pluton.

Conditions

The site is exposed to westerly swells and wind, and also, though the fetch is relatively short, to south easterly winds and wind chop. The wind chop will not usually affect the diver when underwater, bur can make recovery by the boat relatively difficult, particularly if there is wind driven spray. South westerly swell will significantly affect diving due to surge conditions, as the site includes quite shallow areas and a number of narrow gullies and swim-throughs, which can focus and magnify the water movement to an awesome surge, and can provide some adrenalin rushes for the unwary diver. The site is usually at it's best in summer but there may also be occasional opportunities during autumn and early winter. Note that in summer the south east wind may pick up from a calm morning to strong or even gale force by afternoon. This is reasonably predictable and the weather forecast should be consulted.

This is an area which sometimes has upwellings, caused by the south easterly wind, resulting in cold, clear water, sometimes followed by a plankton bloom, which reduces the visibility again.

Keep a lookout for times when the forecast is for low short south westerly swell and light winds, as this will indicate a reasonable chance of good conditions.

Get in

This site can only be accessed by boat. It is about 6.9 km from Hout Bay harbour.

See

Marine life

Typical of the big reefs of the Atlantic coast. Heavy growth of red bait in shallow areas, Split-fan kelp on top surfaces of the reef in moderate depths. Walls, caves and overhangs are covered with a wide variety of sponges, corals, ascidians and other invertebrates. <gallery mode=packed> File:Red algae and pink ball sponges at Kanobi's Reef DSC11175.JPG|Red algae and pink ball sponges File:Red algae and pink ball sponges at Kanobi's Reef DSC11175.JPG|Red algae and pink ball sponges File:Colonial ascidians at Kanobi's Reef DSC11219.JPG|Colonial ascidians File:Pore-plated false coral and multi-coloured sea fan at Kanobi's Reef DSC02546.JPG|Pore-plated false coral and multi-coloured sea fan File:Multi-coloured sea fan on colonial ascidian at Kanobi's Reef DSC11224.JPG|Multi-coloured sea fan on colonial ascidian File:Small basket star and sea urchins at Kanobi's Reef DSC11236.JPG|Small basket star and sea urchins File:Two starfish at Kanobi's Reef DSC11172.JPG|Two starfish File:Red klipfish on orange sponge at Kanobi's Reef DSC11221.JPG|Red klipfish on orange sponge File:Brown klipfish on bryozoan at Kanobi's Reef DSC11223.JPG|Brown klipfish on bryozoan File:Octopus in crevice at Kanobi's Reef DSC02554.JPG|Octopus in crevice File:Cone shell at Kanobi's Reef DSC11210.JPG|Cone shell File:Noble coral and brown sponges at Kanobi's Reef DSC02544.JPG|thumb|Noble coral and brown sponges File:Green moon sponge at Kanobi's Reef DSC02558.JPG|Green moon sponge File:Grey sponge and Rock crab at Kanobi's Reef DSC11199.JPG|Grey sponge and Rock crab </gallery>

Features

Large swimthrough, at 13 m depth, as shown on the map, several deep gullies and a few small caves.

Photography

Good site for photography if the surge is not too strong.

Routes

Drop in near the pinnacle and swim around the rocks at various depths. Start deep and work your way up, inspecting the various zones. It is necessary to keep away from the blinder when surfacing, as the surge over the top can be dangerous to both divers and boats, so it is advisable to swim well away during the ascent, and for this reason a DSMB and compass are recommended. The swimthrough is worth a visit if the surge is not too strong.

Stay safe

Hazards

Cold water, Strong surge in gulleys and swim-throughs. Breaking waves over exposed rock. Sea urchins. Strong offshore winds may develop over a short time.

Skills

Ability to deploy a DSMB is useful, as is ability to use a compass. Divers should be adequately skilled at buoyancy control in surge, and able to fin fairly strongly, unless the swell is exceptionally weak.

Equipment

Take a light to see into dark places, like overhangs and swim-throughs. A compass is useful to keep track of where you are, and a DSMB is useful if you surface away from the reef, which is desirable as the waves break over the blinder. Nitrox may extend your dive time if you are well insulated.

Nearby

Back to the Alphabetical list of sites, or list of dive sites in the Outer Hout Bay area

Other regional dive sites:

Diving the Cape Peninsula and False Bay/Kanobi's Wall - dive site at Duiker Point on the Cape Peninsula west coast