Diving at Humpback Ridge

The dive site Humpback Ridge is an offshore, rocky reef in the Karbonkelberg marine reserve area on the Cape Peninsula, near Hout Bay, a suburb of Cape Town in the Western Cape province of South Africa.

Understand

Map of the dive site at Humpback Ridge near Duiker Point on the Cape Peninsula

See also: Diving the Cape Peninsula and False Bay#Understand

Map of the Blue Flash Reefs, showing Humpback Ridge to the south-east

A fairly massive granite pinnacle in the middle of a more extensive north-south ridge rising to about 12 m. Humpback whales have been seen near these reefs on several occasions.

Position

• 1 Humpback Ridge: S34°01.548' E018°18.142' — (pinnacle), a moderate distance offshore from Oude Schip headland, on the north side of Leeugat Bay, known locally as Maori Bay for the famous shipwreck.

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

Name

The site is named the humpback whales that were seen nearby when the position of the pinnacle was first marked. As it happens, the ridge has a hump at the pinnacle, so the name is appropriate for two reasons.

Depth

Maximum depth in the immediate vicinity is about 21 m, and the top of the pinnacle is at about 4 m. Average depth of a dive is likely to be about 18 m.

Visibility

Visibility is likely to be similar to the other offshore reefs of this part of the Cape Peninsula western seaboard. It may be very good for the region - between 10 and 20 m after a strong south-easterly wind, but this does not usually last long, particularly in summer.

Topography

The pinnacle is a massive but fairly compact outcrop of granite corestone, with high profile deeper reef forming a ridge roughly from north to south.

Geology: Granite of the Pre-Cambrian Peninsula pluton.

Conditions

The site is exposed to westerly wind and waves, so should be dived in calm or south-easterly winds, when the prevailing south-westerly swell is moderate to low. The site is reasonably protected from south-easterly wind chop, but if a really strong south-easter develops then it would be prudent to dive one of the more sheltered inshore sites nearby. The site is usually at it's best in summer but there are also occasional opportunities at other times of the year. This is an area which sometimes has upwellings, caused by south easterly winds, resulting in cold clear conditions, until the sunshine gets the phytoplankton blooming and the visibility can reduce drastically over the course of a day, particularly in summer.

Get in

See also: Diving the Cape Peninsula and False Bay#Boat dives

This site is only dived from a boat, as it is dangerously far offshore and there is no road access to the adjacent shore.

The site is about 8.3 km from the Hout Bay harbour slipway

See

Marine life

See also: Diving the Cape Peninsula and False Bay#The marine ecology

Colourful sponges, noble corals, sea anemones, basket stars, brittlestars and other starfish on the steep rock faces, Heavy growth of kelp in the shallower regions and smaller seaweeds on the top of the reef at middle depths, and sea urchins on the deeper reef top surfaces. Small shoals of hottentot seabream.

• 
  Corals
• 
  Sponges
• 
  Strawberry anemones
• 
  Sponges and anemones

Photography

Theere are lots of fairly small, colourful invertebrates, so macro and wide angle lenses will be most versatile most of the time. On a really good day natural light will be sufficient, but much of the site is deep enough that there will not be much red left in the ambient light, even on a good day, so lighting will be needed to restore colour.

Suggested routes

There are no specific routes to recommend. Start deep and work up the reef, so you can do your safety stop with something to look at if the swell is low enough that the surge is not too strong.

Stay safe

See also: Diving the Cape Peninsula and False Bay#Stay safe

Hazards

No site-specific hazards have been reported. The water will be cold, and may be quite choppy, so it is worth carrying a DSMB and reel to alert the boat of your position if you surface away from the shot-line.

Skills

No special skills required, though it is useful to be able to deploy a DSMB. The site is suitable for fairly fit entry level divers.

Equipment

See also: Diving the Cape Peninsula and False Bay#Equipment

A dry-suit is recommended, as the water temperature can be as low as 8°C, and seldom above 12°C. Nitrox can extend your dive time considerably at this depth range if you can handle the temperature and your cylinder is big enough. Local divers favour EAN 32% and 12 to 15 litre cylinders with a dry suit.

Nearby

• 1 MV Romelia
• 2 Steps
• 3 MV Harvest Capella
• 4 Rachel's Reef
• 5 Wilhelm's Wall
• 6 Die Middelmas
• 7 Hakka Reef Sven's Caves pinnacles
• 8 Hakka Reef Southeast pinnacles
• 9 Twin Towers
• 10 MV Keryavor and the Jo May
• 11 SS Maori
• 12 SAS Gelderland
• 13 SS Oakburn / MV Bos 400
• 14 Die Perd
• 15 Kanobi’s Wall
• 16 SURG Pinnacles
• 17 Star Wall
• 18 Sunfish Pinnacle

Back to the Alphabetical list of sites, or list of dive sites in the Oude Schip and Leeugat area

Other regional dive sites:

• Dive sites of Table Bay and approaches
• Dive sites of the Cape Peninsula east coast
• Dive sites of False Bay offshore and approaches
• Dive sites of False Bay east coast
• Fresh water dive sites of the Cape Town Metropolitan Area