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The dive site Choirboys Reef or Kate's Secret Reef is an offshore rocky reef in the Gordon's Bay area of False Bay, near Cape Town in the Western Cape province of South Africa.


Map of the dive site Choirboys reef in False Bay, South Africa
See also: Diving the Cape Peninsula and False Bay#Understand

This site is far enough offshore to be generally outside the eddy of low visibility that often occurs off Gordon's Bay, but is still reasonably close to the launch sites, and has good biodiversity and more rugged topography than most of the close offshore sites of the area. It appears to be a fairly small area and is mostly unexplored.


  • S34°08.005' E18°45.270' 1 Choirboys Reef

The area is indicated on the SAN chart as a small shoal area above 20m, with a spot depth of 18m. This site is not in a Marine Protected Area. A permit is not required.


Colony of White choirboys ascidians at Choirboys Reef

The name "Choirboys" is derived from the white colonial ascidian of that name which is fairly common at the site.


Maximum depth is about 26 m. and the top of the reef is about 21 m. (Average depth of a dive is likely to be about 23 m.


Visibility is likely to be better than at the Gordon's Bay inshore dives, as it is outside the Gordon's Bay eddy, but is unpredictable. Surface conditions may not accurately predict bottom conditions, particularly in late summer and autumn, after the thermocline develops.


The site is a sloghtly raised area on the ridge which runs out from off Strand to Steenbras Deep. There is a not a lot of variation in depth over the site, and reef profile found has mostly been 2&nbspm or less.The surrounding reef is very flat. The ridges tend to run roughly north-south, following the strike of the strata.

Geology: Probably Pre-Cambrian sedimentary rock of the Tygerberg series. Strike is probably roughly North-South, Dip appears to be steep. The reef is an outcrop of hard rock strata, probably a sandstone.


The site is exposed to winds from all directions, but north-westerlies and south-easterlies will not have enough fetch to develop a substantial wind wave, and wind chop will die down in a few hours. South westerly swell entering the bay will reach this area uninterrupted, and will be the major influence on diving conditions. The site is fairly shallow and surge will be likely in any reasonably long period swell. The site should be dived in low swell, preferably short period, and moderate to light winds.

Get in[edit]

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

Usual access: boat dive from Gordon's Bay or Harbour Island. The site is about 10 km from Harbour Island, or (distance)km from Gordon's Bay old harbour.


Marine life[edit]

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


The topography is not particularly photogenic, and visibility is not likely to be exceptional, so macro and general close-up wide-angle photos are likely to produce the best results. Artificial lighting is recommended for better colour and clearer photos.

Suggested routes[edit]

There are no recommended routes. Swim around and explore, or hang out near the shotline and take photos as best suits your style and inclinations at the time.

Stay safe[edit]

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


There are no known site-specific hazards


The site is too deep for entry-level certification, and good buoyancy skills are required to avoid damaging the fragile reef life.


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

No special equipment required, though a light and DSMB are recommended.


Choirboys Reef and other offshore dive sites of False Bay

Other offshore dive sites of False Bay:

Back to the Alphabetical list of sites, or list of reef dive sites in the northern False Bay offshore area

Other regional dive sites:

This dive guide to Choirboys Reef is a usable article. It has information on location and equipment as well as some complete entries on what to see. An adventurous person could use this article, but please feel free to improve it by editing the page.