Archaeology Notes
Event ID 851130
Category Descriptive Accounts
Type Archaeology Notes
Permalink http://canmore.org.uk/event/851130
NM74SW 8001 7289 4036
N56 30.0333 W5 41.4333
NLO: Rubha an Ridire [name: NM 733 399]
Sound of Mull [name centred NM 58 46].
Formerly entered as Site no. 8578.
About midnight on Tuesday, the steamer THESIS, en route from Middlesbrough to Belfast, struck a reef at Inninmore Point [Rubha an Ridire]. The vessel was loaded with pig iron, and sank in deep water bows first, four hours after striking the rock. The eleven crew were all safe, and landed at Craignure.
Source: Oban Times, October 1889.
16 October 1889. THESIS. 2 years of Belfast. Lloyds 100A1. Survey 9/89. Iron steamship. 151 ton. Master G. Wallace. Owner W.A. Granger, Belfast. Belfast to Middlesbro'. Iron ore. Wind S2. Near Barony Point, Sound of Mull.
Source: PP Abstracts of Shipping Casualties on Coasts, or in Rivers and Harbours of the UK July 1889-90 (1890-91 [C.6468] LXXVI.485).
NMRS, MS/829/68 (no. 1513).
THESIS, boiler is in place, ribs of the bow are exposed.
(Transits for locating the wreck are illustrated in the source).
Source: Butland & Siedlecki, BSAC Wreck Register, Scotland 2, 1987.
Quality of fix = PA
Horizontal Datum = OGB
General water depth = 30
Orientation of keel/wreck = EW
Circumstances of Loss Details
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The vessel foundered.
Source: BSAC Wreck Register.
The vessel was wrecked in fog while en-route from Belfast to Middlesborough carrying iron ore.
Source: Diver Magazine - 1982.
Surveying Details
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28 September 1981. The THESIS is the locally accepted name of the wreck - no confirmation. Its position is 56 30 00N, 005 41 30W. The wreck is lying at 90 degrees to the shore with its bows pointing to shore. The bow is in 15-17 metres, the stern in 30 metres. The wreck appears very old with its plates falling off its ribs.
Report by W. Mcgregor, lettter dated 22 September 1981.
18 Janaury 1982. The hull is complete. There is pottery in two holds. The wreck is lying with 15 metres height in a general depth of 30 metres, about 500 metres SE of Eilean Rubha an Ridire, just south of a small bay.
Source: BSAC Wreck Register vol.4.
11 June 1982. The wreck is intact, but very fragile. Its tonnage is given as 500 gross, 151 net.
Source: Diver Magazine - 1982.
23 September 1991. The wreck is easy to locate by echosounder. It is stated to have been lost in 1891 [the date differs from above]. The wreck has bee substantially salvaged by R Grieve of the Salen Diving Centre. Many of the plates are missing from the bows, but still basically intact. The wreck is heavily encrusted with plentiful fish life. Crockery can still to be found. An excellent dive. The tidal stream runs at up to 2 knots.
Source: Dive NW Scotland by G Ridley.
Hydrographic Office, 1995
(Classified as iron steamship, with cargo of iron ore: date of loss cited as 16 October 1889). Thesis: this vessel stranded near Barony Point, and sank off Rubha an Ridire. Capt. Wallace.
Registration: Belfast. Built 1887. 378grt. Length: 51m. Beam: 8m.
(Location of loss cited as N56 30.05 W5 41.43).
I G Whittaker 1998.
Material reported under RoW amnesty (2001):
A068 1 brass-bound deadlight (from seabed).
NMRS, MS/829/32.
Material reported under RoW amnesty (2001):
A3131 ship's name letters 'THESIS': from seabed
A3349 1 brass bolt:from seabed.
NMRS, MS/829/35.
The general (dry) cargo ship is typical of the type and period, and broadly similar to the nearby Shuna (NM54NE 8004) and Hispania (NM55SE 8005), which were built in 1909 and 1912 respectively.
This wreck has essentially been reduced to deck level and much of the hull plating forward has been removed, presumably during extensive salvage operations conducted (date unknown) by Mr Richard Grieve of the Mull Diving Centre, Salen. The remaining identifiable features and fittings comprise the boiler and engine (amidships), the steering gear (aft) and numerous elements of the cargo-handling gear. The rudder and propeller have been removed but the counter stern is impressive.
The wreck is not specifically noted on the chart but the indicated location falls on a SW-facing slope above the main drop-off into the glacial trough. The seabed is mixed but generally shelly. The bow points inshore and is in about 22m depth of water; the stern is in about 33m.
(For location plan, see Moir and Crawford 1994, 199).
Information from RCAHMS (RJCM), 5 November 2002 [visited on numerous occasions 1995 to date].
Moir and Crawford 1994; R and B Larn 1998; Diver 2001.
HO chart no. 2390 (1976, revised to 1991).
This ship is an example of a once-common type of general cargo ship, of which no examples appear to remain extant. No builders' records appear to survive for the vessel, which is extremely popular among recreational divers.
The iron-built steamship was built in Belfast by McIlwain, Lewis and Co, and launched in 1887. Powered by a twin-cylinder engine of 60hp, she measured 50.9m in length by 7.64m in beam, and drew [nominally] 3.53m. While carrying a cargo of pig iron and iron ore between Belfast and Middlesbrough on 16 October 1889, she struck a reef at Inninmore Point before sinking off Batony or Barony Point in the Sound of Mull.
The Thesis now lies heeled to port in a scatter of debris with her bows at the foot of a rocky slope leading to the shore; the depth at the deck varies between 12m at the bow and 30m at the stern. The vessel has been subjected to considerable salvage effort and little of the bridge superstructure remains. Much of the hull plating on the forward holds has been lost and some deck plating has also collapsed. Her remains are heavily encrusted with marine life (including sea-firs and soft corals), and the wreck is subject to strong currents.
Study of the Thesis forms part of the work of the Sound of Mull Archaeological Project (SOMAP), the research project of Nautical Archaeology Society Scotland. The wreck has also been adopted under the NAS Adopt-a-Wreck scheme, together with the nearby John Preston [NM64SE 8005].
Survey operations since 2000 have concentrated on drawing a deck plan, two longitudinal baselines being initially set up forward of the superstructure. Operations have been consistently hampered by twisting of the deck and the presence of protruding debris and fittings.
In 2002, different procedures were adopted to survey the deeper (aft) portion of the wreck. Nitrox was used for safety and the area was divided into four portions, the sides of the large deck openings forming a baseline. In the event, the total planned length of the vessel was measured as within 0.5m of that documented. In addition, extensive video footage was taken (by Chris Underwood), a qualitative assessment of the marine biology was carried out (by Craig Burton) and monitoring stakes were put in place around the wreck to establish the pattern or erosion and/or accretion of the seabed. Further discoveries during this work included a stowed anchor (forward) and cracks in the deck (on the starboard side); these latter indicate the start of structural deformation through longitudinal opening.
Further research is aimed to refine the current picture of the wreck, to establish a means of interpretation, and to investigate the rate of deterioration.
(Illustration: deck plan).
Sponsor: Historic Scotland.
B Kaye and J Cook 2002.
R and B Larn 1998; NMRS, VID/32; NMRS, MS/2745.
Mineralogical examination of samples of coal and iron ore collected from the wreck of this vessel [in 2004] were carried out by the British Geological Survey, Keyworth, Notts.
The coal sample is of medium-volatile coking coal, typical of Westphalian (late Carboniferous) deposits in South Wales, Durham and the Ruhr. This type of coal was typically used for coke manufacture in the steel industry, rather than in fuelling ships, for which purpose low-volatility deposits were referred. This sample presumably derives from the ship's cargo (as against bunkers), and was possibly intended for use in the shipbuilding industry of Northern Ireland.
The iron ore sample comprises fragments of haematite and goethite, held together by earthy iron oxide (most probably goethite). Traces of chalcedonic silica and magnetite were present in material which was evidently unsmelted. Magnetite is unusual British ores, but occurs exceptionally in the Rosedale mines, near Middlesborough.
(Report illustrated with photomicrographs).
RCAHMS, MS/2315.
(Location cited as N56 29.932 W5 41.515 (WGS84): [NGR NM 7289 4036]). This wreck lies on a sloping gravel seabed. The bow rests on bedrock and stern is embedded into softer gravels, at depths of 14 and 31m respectively below chart datum. The wreck has been the subject of intermittent salvage, and has been popular with recreational divers since the 1980's. Comparative diver survey between 2000 and 2004 during the Sound of Mull Archaeological Project (SOMAP) has demonstrated continuing deterioration and deformation of the forward structure; significant deck collapse is apparent, and the hull is deformed by a twist (possibly by as much as 0.5m) to port in the same area.
The sidescan imagery clearly illustrates the holes in the deck where heavy objects (notably winches) have fallen into the interior. It also illustrates well the degree of loss of hull plating, and the form of such features as the engine and boiler. However, comparison of specific measurements from sidescan imagery and diver survey reveals a degree of discrepancy.
Diver survey has indicated that the stern may lie buried into the silt to a depth of up to 2m; some seabed scour is also apparent along both sides amidships. These findings are confirmed by sonar imagery, although the degree of burial at the stern may be slightly over-emphasised. The sedimentary accumulation at the stern may contain material from the ship's poop, and so have significant archaeological potential. The sidescan imagery indicates areas of exposed reef adjacent to the starboard quarter and at the bow. This suggests that the stern of the vessel is trapping sediment moving SE on ebb tides.
Some 'blurring' of the features at the stern is apparent on the imagery; neither the poop nor the trapezoidal void within the stern can be distinguished. Around the bow, the holds, boilers and anchors cannot be clearly distinguished. This may be due to the imagery being derived from multiple passes. In this case, the accuracy of the measurements remains below that required for archaeological survey.
(Survey area defined: report illustrated with chart extract and colour sonar imagery. Specific sonar-derived measurements cited in comparison with equivalents from diver survey).
MS/2338 (pp. 5, 19-23, 24, 86, 92).
