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Diving the Cape Peninsula and False Bay/MV Katsu Maru

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Diving the Cape Peninsula and False Bay : MV Katsu Maru
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Diving the Cape Peninsula and False Bay/MV Katsu Maru

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The dive site M.V. Katsu Maru is a recent wreck in the Hout Bay area on the Atlantic seaboard of the Cape peninsula, near Cape Town in the Western Cape province of South Africa. Information is provided which may assist in planning Recreational and Research Scuba diving at this site, and links to photographs of marine organisms that have been found there.

(reasons to dive at this site)

File:(sinking if the Katsu Maru.jpg)
The sinking of the Katsu Maru

Name "M.V. Katsu Maru"

The Japanese trawler Katsu Maru #25 struck an unidentified object and was holed on the port side. While under tow to Hout Bay the vessel flooded and it sank in the bay on 7th August 1978.

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Sketch of how the wreck lies on the bottom.


S34°03.913’ E018°20.94’ (roughly)

In the middle of the mouth of Hout Bay, About parallel to and 30m to the West of the wreck of the M.V. Aster

This site is in a Marine Protected Area (2009)


Access is only reasonably practicable by boat. The site is about a 2.2km ride from the harbour slipway. The wreck is in the harbour approaches, and there may be significant boat traffic.


The site is exposed to south westerly swells, which can cause a strong surge. The site is usually at it's best in summer but there are also occasional opportunities in autumn and winter.

This is an area which sometimes has upwellings, caused by strong south easterly winds, resulting in cold clear water, which may develop a plankton bloom over a few days, which will reduce the visibility again.

Keep a lookout for times when the south west swell is low and short period, and there is not too much south easterly wind forecast.


Maximum depth about 28m meters in the scour at the bow and stern. Average depth of the wreck is over 20m.


Flat sand bottom.


The wreck lies on its starboard side on the flat sand bottom at about 27m. The ship is on its starboard side heeled at slightly more than 90°, and imbedded in bottom sand. The bow points towards approximately magnetic south. There is moderate scouring at bow and stern, usually to about 28m maximum, depending on the tide. The wreck is essentially intact. The vessel still looks much like when it was afloat. The hull is basically intact with a few holes rusted through, but will probably deteriorate quite rapidly as the plating is getting very thin in places (2005). The superstructure and funnel are also identifiable. The foredeck still has a large winch, and there appear to be gas cylinders on a rack. The stern deck areas are a bit cluttered with debris. There is an external bar keel about 150mm deep along the length of the hull.


Cold water, occasional fog, boat traffic. Possible entrapment if the wreck is penetrated. Some of the structure may be unstable. Strong surge if the swell is large or the period long.

Skill level

No special skills required unless penetration is intended. It is necessary to be qualified for 30m dives.


Macro and/or wide angle equipment recommended


A light will restore colour and allow you to look into the wreck. Reel and DSMB are worth carrying in case it is necessary to surface away from the shotline. A dry-suit is recommended as the water is cold, Nitrox is recommended to extend no-decompression time.

Marine life and features

The wreck is heavily encrusted with common feather stars and sponges, with some colonial ascidians and hydroids. The hull is said to provide challenging penetrations, and conger eels have been reported from the interior.

Suggested Routes

No special route recommended. The deck has more interesting details than the bottom.



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