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St Dunstan

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Type: Wreck
Qualification Level: Sports Diver
Depth Range: 19 – 27m
When to dive: Slack water less than 0.5 knot. (Slack water is 3.5 hours after high water Portland and 3.5 hours before high water Portland.)
Key Features: Wreck, lots of fish, lobsters, swim throughs
Chart Plotter Name: ST DUNSTAN
GPS Location:N50°38.2982′ W002°42.0510′

Launch Site Address: West Bay, Dorset, DT6 4HE
Google Maps: Click For Map
Travel time from Boat Shed: 1 hr 20 mins
Site Facilities: :. Toilets and cafe huts near slip, Parking both sides of harbour but early arrival to get best parking, Air available in the village, plenty of free parking for the boat trailer.
Launch Fee: Paid annually by SSAC – sticker on RIB console
Distance over water: 4.7 nm 20 mins @ 20 knots
Is it permanently bouyed: No
Air Fill: Angling Centre, 10a West Bay Rd, West Bay, Bridport, Dorset DT6 4EL (formerly, West Bay Water Sports.)

Coastguard 999 or 112 (both numbers function identically)

For advice on diving related incidents or urgent and emergency hyperbaric referrals including carbon monoxide poisoning in the South West of England contact DDRC on +44 (0)1752 209999

Hyperbaric Recompression Chambers:
DDRC: at Tamar Science Park, Derriford Road, Plymouth, PL6 8BQ. 24hr Advice Line – 01752 209 999

The Diver Clinic, 7 Parkstone Road (A350), Poole, Dorset, BH15 2NN. 24 hour cover Telephone: Day time – 01202 678278, Emergency 07770 423637 (answer service) A return call will be made

BBC Weather
XC Weather
BBC Tide Tables
Windfinder.com

Article Credits: Divernet
WreckSite

Article Author: John Todman

General Information

Depth 28m with Bow 5-8m proud of gravel seabed. Wreck lies NE to SW with bows to SW

The wreck is an old bucket dredger built in 1894 but was being used as a mine sweeper when she hit a mine on 23rd Sept 1917. She is a 200ft long iron vessel which now lies upside down.

There is a pair of enormous boilers right at the front of the wreck. The boilers and engines are at the front of the ship to make room for the dredging machinery further aft.

Just off the starboard side of the wreck are a set of enormous gears, part of the drive machinery for the dredge system. The arm and bucket assembly has fallen clear of the hull and is pretty much intact, lying on one side and leading towards the stern. A few buckets before the end of the arm and just out from it, a large pulley block is part of the mechanism used to raise and lower it.

The rounded stern of the wreck is only a few metres away lying on its port side. The interior has collapsed leaving just the shell of the stern to swim through where it has broken clear of the twin keels. A single rudder lies resting flat on the seabed. The port keel is completely inverted, and the starboard keel has collapsed towards it. The hull of the St Dunstan would have had a well in the middle for the dredge arm to be lowered, with one keel running either side of the well.

The final part of the dredging mechanism is a large winch drum used to raise and lower the dredging arm. This is still tightly packed with cable and on one end there are another pair of big gears which would have driven the winch from one of the main engines. The propeller shaft continues forward along the broken open keel and back inside the wreck, ending in the engine room with a bevel gear.

Whereas most steam driven ships would have had no gearbox, with the engine driving directly onto the propeller shaft, on the St Dunstan the main engines would have also been used to power the dredging mechanism, hence the need for elaborate gear systems.

Warning: Watch out for possible netting on the wreck. Swim through may start to collapse?

 

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