Diving the Cape Peninsula and False Bay/Finlay's Deep

The dive site Finlay's Deep or Mont Blanc is an offshore rocky reef in the Castle Rocks restricted area on the False Bay coast of the Cape Peninsula, near Cape Town in the Western Cape province of South Africa.

Diving the Cape Peninsula and False Bay/Finlay's Deep Halal Travel Guide

Mont Blanc Reef map - Map of the dive site at Mont Blanc Reef, commonly called Finlay's Deep

Thit is a small reef with a large number of Gorgonian sea fans.

Position

• S34°15.005' E018°29.194' Finlay's Deep GPS -34.250083,18.486567 : About 900 m directly offshore of Finlay's point

This site is in a Marine Protected Area (2022). A permit is required. The site is entirely inside the Castle Rocks Restricted Zone.

Name

The name "Finlay's Deep" is a reference to Finlay's Point inshore, and that the reef is relatively deep. The alternative name is “Mont Blanc” as the top of the main granite boulder appears white as if snow-covered.

Depth

Maximum depth is about 30 or 31 m and the top of the reef is reported to be about 20 m.

Topography

The reef is a narrow outcrop of granite about 37 m long from north east to south west on an axis of 39°magnetic, and about 7 m wide. The reef is notched by a number of fairly deep cracks, but mostly they are not very wide, The highest point is only a few metres shallower than the sand bottom which is at 30 m. Some sections of the reef are quite low, in the order of 1 m at the north end. There appears to be another outcrop slightly further offshore, probably about 5 to 10 m to the east, of unknown extent.

Geology: Late Pre-Cambrian granite of the Peninsula pluton.

Conditions

The site is exposed to swell from the south east, and to a certain extent, from the south west. Longer period swell will make conditions on the reef uncomfortable due to strong surge, but short period waves will just make it uncomfortable on the boat. Visibility is less predictable, and at this time is largely a matter of luck and reports from divers who were in the area recently.

The site is usually at it's best in winter but there are also occasional opportunities at other times of the year, though least often in summer, when the south east wind tends to blow much of the time.

Muslim Friendly Travel TO Diving the Cape Peninsula and False Bay/Finlay's Deep

-34.2534|18.482|width=|align=* Finlays Deep reef and nearby dive sites}} Access to this site is only by boat. The site is roughly 3.2 km from Diving the Cape Peninsula and False Bay/Miller's Point slipway|Miller's Point slipway and 10.5km from Diving the Cape Peninsula and False Bay/Simon's Town jetty|Simon's Town jetty.

What to See

Marine life

The most obvious group is gorgonian sea fans. There are large numbers of Palmate, Sinuous, Flagellar and Multicolour sea fans present but not very big. The surface of the rock is encrusted with Mauve sea cucumbers, Strawberry anemones and sponges, with a scattering of Elegant feather stars and Striped anemones.

• Colonial ascidian at Finlay's Deep P9055139 - Colonial ascidian
• Green moon sponge at Finlay's Deep P9055131 - Green moon sponge
• Multicolor sea fan at Finlay's deep P9055135 - Multicolour sea fan
• Reef life at Finlay's Deep P9055122 - Reef life at Finlay's Deep
• Sea fan at Finlay's Deep P9055151 - Sea fan
• Sea fan with basket star at Finlay's Deep P9055154 - Sea fan with basket star

Photography

The site is usually dark due to the depth, so anything other than macro will require an external flash.

Routes

No particular route recommended. The reef is small enough to explore on a single dive. If you have time left you might explore to the east of the southern end in case there is more reef in that area.

Stay Safe

Hazards

The site is quite far offshore, and the area is often dived in an offshore wind, so there may be a risk of getting lost on the surface if the wind comes up strongly.

Skills

Certification appropriate to the depth will be expected, but no special skills are required. Ability to deploy a DSMB may be useful.

Equipment

No special equipment is required, but a DSMB will be useful if you have to surface away from the shotline.

Nearby

• Diving the Cape Peninsula and False Bay/Graeme's Spot and The Jambles|The Jambles GPS -34.248083,18.481500
• Diving the Cape Peninsula and False Bay/Graeme's Spot and The Jambles|Graeme's Spot GPS -34.248383,18.481950
• Diving the Cape Peninsula and False Bay/Finlay's Point|Finlay’s Point GPS -34.248767,18.477550
• Diving the Cape Peninsula and False Bay/Finlay's Pinnacle|Finlay's Pinnacle GPS -34.249500,18.479667
• Diving the Cape Peninsula and False Bay/Carnaby Street Pinnacle|Carnaby Street Pinnacle GPS -34.249750,18.482000
• Diving the Cape Peninsula and False Bay/Atlantis Reef|Atlantis Reef GPS -34.251250,18.483783
• Diving the Cape Peninsula and False Bay/Sherwood Forest|Sherwood Forest GPS -34.25317,18.48350
• Diving the Cape Peninsula and False Bay/Partridge Point#Fish Tank|Fish Tank GPS -34.253833,18.482167
• Diving the Cape Peninsula and False Bay/Partridge Point|Partridge Point - Seal Rock GPS -34.255617,18.481533
• Diving the Cape Peninsula and False Bay/Partridge Point|Partridge Point - Deep Partridge GPS -34.255833,18.483333
• Diving the Cape Peninsula and False Bay/Partridge Point|Partridge Point - Dave's Caves GPS -34.256300,18.478400
• Diving the Cape Peninsula and False Bay/Partridge Point|Partridge Point - Big Rock GPS -34.257750,18.479800
• Diving the Cape Peninsula and False Bay/Partridge Point|Partridge Point - Peter's Pinnacles GPS -34.258583,18.478117

Back to Diving the Cape Peninsula and False Bay#Partridge Point area

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