Monthly Archive for July, 2008

Concha (Site 5004)

Multibeam sonar image - Concha 2 Documentary research and geophysical data have identified this wreck as the Belgian steamer Concha, built in 1877. The vessel sank after colliding with the steamer Saint Filians. The Concha’s valuable cargo of tin and copper ore was salvaged shortly after its sinking, but the iron ore cargo still remains in and around the wreck site.

The site is situated 7.5nm SSE of Littlehampton, West Sussex between the Outer Owers and Kingmere Rocks. It lies in 10.7m (CD) of water on a sandy/gravelly seabed. The dimensions of the wreck are 66m in length and 7-10m in width.

In 2002 the site was geophysically surveyed by Wessex Archaeology, using sidescan sonar and magnetometer. The sidescan image shows the vessel upright on the seabed and largely unburied, and the magnetometer results indicate a large metal anomaly associated with the wreck; presumably a combination of the iron ore cargo and metal hull. Technical problems meant that no diving survey of the wreck was completed that year.

Concha - anchorIn 2003, the area was re-surveyed using multibeam, sub-bottom profiler and magnetometer, confirming the results collected from 2002.

Most recently, in the summer of 2005, WA used a ROV (remotely operated vehicle) to survey the site, and obtain a video archive of the wreck site. Examples of the video footage together with underwater photos, a site plan and more information about the Concha (including its construction, fittings, machinery, cargo and artefacts) can all be viewed here.

A list of the Concha’s vessel specifications from Lloyds Register can be viewed here.

B-24 bomber near Eastbourne (Site 5001)

Sidescan Sonar - B-24 Liberator

This site is thought to be the remains of a World War II B-24 Liberator bomber.

It is located close to the Sussex coast, near Eastbourne.

In August 2002, Wessex Archaeology surveyed the site using sidescan sonar, although the results produced were not consistent with the wreck of a plane.

Umba (Site 5005)

Sidescan sonar - Umba

This wreck is the remains of the Umba, an early 20th century merchant vessel that was torpedoed by a German submarine in 1918. The wreck is also commonly known as the “Gun Wreck” after a Russian 6 pounder gun was found mounted on the poop.

The site is located 5.5nm south of Hastings, just to the east of Hastings Shingle Bank. It is lying at a general depth of 22m (CD).

In 2002 the wreck was surveyed using sidescan sonar and magnetometer. The geophysics results confirmed that the vessel was built of either steel or iron, and although largely buried, its dimensions are 96m x 13m. Sidescan images show the wreck is lying on an even keel and standing about 4.5 metres high. The site was not dived during this year’s fieldwork due to hazardous dive conditions.

In the summer of 2005, the site was surveyed using a ROV (remotely operated vehicle). Most of the original wooden decking still remains on the poop, showing how well preserved the wreck is. Examples of the ROV video footage together with underwater photos, a site plan and more information about the Umba (including its construction, vessel type, fittings and machinery) can all be viewed here.

Swash Channel Wreck

The Swash Channel wreck was discovered in 2004 during a geophysical survey by Wessex Archaeology in advance of dredging to deepen the approach to Poole Harbour. The wreck lies in approximately 6-9 metres of water with its long axis orientated north-east to south-west.

The site is part of the side of an unknown vessel, with frames, ceiling and outer planking, possible knees and a fragment of decking, together with other miscellaneous features. It appears that a substantial section of the top timbers, including circular ports and railings, survives in very good condition.

Swash Channel Designated Wreck 7Swash Channel Designated Wreck 5Swash Channel Designated Wreck 3

The site was designated as a protected historic wreck site in 2004. English Heritage now administers the wreck and Bournemouth University are actively investigating the site.

Wessex Archaeology’s Diving Investigations

Following the site’s discovery it was subject to an initial diving assessment on behalf of Poole Harbour Commissioners. Swash Channel Designated Wreck 1Subsequently Wessex Archaeology was asked by English Heritage to investigate the wreck as part of our work under the Protection of Wrecks Act (1973) in 2005.

The divers produced a photographic survey of the exposed site, prepared a georeferenced plan of the main exposed archaeological features, and made detailed measurements of the features on the site. Wessex Archaeology was then commissioned to carry out sandbagging of the areas of the wreck deemed under threat and to remove various vulnerable finds from the existing channel slope, in advance of dredging. An ambiguous dendrochronological date was obtained, following the sampling of two pieces of wood from within the ship’s structure, which indicated that the timber had been felled in or after 1585 and that the tree grew in Germany or Holland. Swash Channel Designated Wreck 8

From the study of the structure it is thought that the vessel may be longer than 40 metres in length, the large size of the guns supports this view. Pottery from the site implies a date later than 1630 while the limited number of guns suggests it may have been a merchant ship.

Unknown wreck off Hastings (Site 5003)

Sidescan sonar - metal wreck

In August 2002, Wessex Archaeology carried out a sidescan sonar and magnetometer survey of this unnamed site, south of Hastings, East Sussex. The site was located using data obtained from the UKHO. There was no dive survey due to adverse weather conditions.

The wreck has a significant magnetic signature, suggesting it is constructed from a ferrous material.

Sidescan data shows it to be 75m long and 15m wide, standing 4.8m proud of the seabed. Two masts are evident protruding from the wreck, about 25m in length.

No further work has been carried out to identify the site.