The dive site MV Ker Yar Vor and the Jo May is a recent wreck site on an inshore rocky reef in the Karbonkelberg area on the Atlantic seaboard of the Cape Peninsula, near Cape Town in the Western Cape province of South Africa.

Understand

Map of the dive site at the wrecks of the Ker Yar Vor and the Jo May

Diver at the wreck of the MFV Ker Yar Vor

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

Position

1 Ker Yar Vor and the Jo May: S34°02.053’ E018°18.631’

These two wrecks lie next to each other approximately between the Maori and the Gelderland.

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 name "MV Ker Yar Vor and the Jo May" refers to the two wrecks which are the features at this site. The Jo May sank first and not much of her remains. The wreckage is identifiable as this was a wooden vessel.

The Ker Yar Vor was a steel lobster fishing vessel registered in Cape Town which was sunk on 10th August 1979 in Maori Bay

LOA approx 30 m, approx 300 ton

The ship was similar to the MV Aster,

Depth

Maximum depth is about 27 m. The top of the wreckage is about 24 m, and the local high part of the reef is at about 18 m. Average depth of a dive at this site is likely to be about 24 m.

Visibility

See SAS Gelderland. Visibility on a good day may be in excess of 20 m, but is more likely to be less than 10 m. A plankton bloom following an upwelling may reduce visibility at the surface, but it may improve considerably at depth, though it will probably be quite dark in these conditions.

Topography

The Ker Yar Vor is quite broken up, but the stern is still recognisable. It is the southernmost part of the site, which lies largely in a gap between a large pinnacle to the north east and a more extensive area of high reef to the west. Most of the Ker Yar Vor is in relatively small pieces. The Jo May is represented by a few pieces of wood. One is quite a large beam with brass or bronze drift bolts. This lies amongst the wreckage of the Ker Yar Vor to the east of the wreck.

Geology: Pre-Cambrian granite of the Peninsula pluton.

Conditions

Conditions will be similar to SAS Gelderland, but the wreck is slightly more sheltered from south westerly swell by Duiker Point.

The site is exposed to north westerly winds and seas, so should be dived when the wind is from the south, preferably south east, and is often good in strong south easterly winds when most other sites are too exposed to be safe. The site is reasonably protected from south westerly swell.

The site is usually at it's best in summer but there are also occasional opportunities in other seasons.

This is an area which sometimes has upwellings of clear cold water, caused by strong south easterly winds, resulting in good visibility (may exceed 20 m) and cold temperatures (as low as 8°C).

Get in

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

Boat access only. The site is about 7.7 km from Hout Bay harbour

See

Marine life

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

Like the rest of the bay between Oude Schip and Duiker point, the reef life is relatively low in invertebrate diversity, and dominated by algae, so it tends to be pinks, reds and browns. There are a few splashes of colour, and quite a number of sea urchins, but this is not a site for critters. In 2020 and 2021 parts of the reef at about 24m depth on steep rock faces were seen to have large numbers of young noble coral colonies, mostly between 25mm and 50mm tall. Brooding cushion stars are moderately common, and large areas are covered with red seaweeds

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  Red seaweeds are common in this area
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  There are occasional splashes of colour on the reefs
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  Orange "Choirboys" colonial ascidians on the reef
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  Kelp and red seaweeds on the reef
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  Young colonies of noble coral on the reef
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  Brooding cushion star on the reef

Features

The main feature of the site is the wreckage of two vessels, one in fairly broken, but still interesting condition, the other almost totally broken up and mostly gone.

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  Stern of the wreck of the MFV Ker Yar Vor
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  Unidentified wreckage a bit south west of the Ker Yar Vor
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  The stern of the Ker Yar Vor
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  A wooden beam with bronze drift bolts, probably from the Jo May
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  Much of the Ker Yar Vor is broken up
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  Wreckage of the Ker Yar Vor

Photography

Wide angle photography of the wreckage and surrounding reef structure is most likely to be worthwhile. On a good day the lighting may be adequate, and on a bad day, go somewhere else, or don't bother to try photography.

Suggested Routes

The site is small and compact, and may be comprehensively visited on a single dive. No specific route is recommended.

Stay safe

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

Hazards

This is the wreck of a small steel vessel. There may be sharp edges and pointy bits to snag the unwary diver, particularly if the visibility is poor and surge strong. There may be places an incautious diver could find to get trapped, but they are not obvious. There are no obvious penetration opportunities, and if there are, the interior space will be quite small. Hypothermia is far more of a risk.

Skills

No special skills recommended. Divers should be certified and competent to dive the depth, and ability to deploy a DSMB may be useful, however the site is compact and it should usually be possible to return to the shot line.

Equipment

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

Dry suits or very good wet suits are recommended, and Nitrox can significantly extend the dive time of a well insulated diver.

Nearby

• 1 MV Harvest Capella
• 2 Rachel's Reef
• 3 Humpback Ridge
• 4 Wilhelm's Wall
• 5 Die Middelmas
• 6 Twin Towers
• 7 SS Maori
• 8 SAS Gelderland
• 9 SS Oakburn / MV Bos 400
• 10 Die Perd
• 11 Kanobi’s Wall
• 12 SURG Pinnacles
• 13 Star Wall
• 14 Sunfish Pinnacle
• 15 Canyon
• 16 Stonehenge Dusky Pinnacles - Coral Pinnacle
• 17 Stonehenge Blinder

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