Archaeology of shipwrecks

The archaeology of shipwrecks is the field of archaeology specialised in the study and exploration of shipwrecks. Its techniques combine the ones of archaeology with those of diving.

It is necessary to understand the processes by which a wreck site is formed to take into account the distortions in the archaeological material caused by the filtering and scrambling of material remains that occurs during and after the wrecking process.

When a ship is wrecked, it suffers many changes of state until the remains eventually reach equilibrium with their environment. Initially, the wrecking process changes it from the human organised form of a working vessel to an unstable state of structure and artefacts underwater. Natural forces act upon it during the wrecking process and continue to act until equilibrium is reached. Heavy items sink rapidly, lighter items may drift before sinking, while buoyant items may float away completely. This causes a filtering and scrambling of the material remains. The sudden arrival of a structure on the seabed will change the currents, often resulting in new scour and deposition patterns in the seabed. Once underwater, chemical processes and the action of biological organisms will contribute to the disintegration. At any point in these processes, humans may have intervened, for example by salvaging items of value.

Prior to being wrecked, the ship would have operated as an organised machine, and its crew, equipment, passengers and cargo need to be considered as a system. The material remains should provide clues to the functions of sea-worthiness, navigation and propulsion as well as to ship board life.

Finally the ship as a means of transport can be considered as an element in a geographically dispersed social, political and economic system. Warships impose political will by force; cargo vessels exist in a system of commerce; while passenger carrying vessels give clues to social classes and structure. Social status may also exist within the ship, for example, between segregated officers and seamen.

Archaeological theories of shipwrecks

Muckelroy's model

A systematic model for the characterisation and interpretation of the archaeology of shipwrecks was first proposed by Keith Muckelroy in 1976 [Muckleroy, K., 1976. The integration of historical and archaeological data concerning an historic wreck site: The 'Kennemerland'. World Archaeology 7.3 pp 280-289. ] Muckelroy's system model describes the evolution of the material remains of the ship from the wrecking process, subsequent salvage operations and the disintegration and rearrangements of the remains from environmental factors. Although Muckelroy considered both natural processes and human activity in his model, subsequent research has mainly expanded the environmental factors and there has been little published on the human processes.

Considering human intervention

A paper by Martin Gibbs in 2006, [Gibbs, M., Cultural Site Formation Processes in Maritime Archaeology: Disaster Response, Salvage and Muckelroy 30 years on. International Journal of Nautical Archaeology vol 35.1 pp 4-19 ] expands Muckelroy's model to consider human behaviour at the time of the disaster and the long term relationship between people and shipwrecks. This model utilises studies of humans involved in disasters to characterise the human activity into phases around the time of the wrecking. This model considers:
* Pre-impact threat phase, in which humans considering the risk may take avoiding action which results in there being no wreck, or may take unsuccessful action to mitigate the perceived threat, for example the wreck location may be the result of attempting to avoid some perceived greater threat. Stowage of cargo may also indicate consideration of threat.
* Pre-impact warning phase, in which humans may take drastic action to avoid catastrophe, for example, running a vessel ashore, jettisoning cargo or running out anchors.
* Impact, in which the decision is made to abandon ship or remain aboard, and, for example, attempt to refloat.
* Post impact, where survivors regroup and, for example, salvage their own goods or make repairs.
* Rescue and Post-disaster where the vessel is abandoned and in which third parties may be involved in salvage or in removing remains that present a hazard to navigation.

ee also

*Maritime archaeology
*Underwater archaeology
*List of shipwrecks
*Rusticle
*Wreck diving
*Sea Research Society
*Nautical Archaeology Society

Famous shipwrecks

* Uluburun Late Bronze Age shipwreck, 14th century BC
* Cape Gelidonya Late Bronze Age shipwreck, c. 1200 BC
*Antikythera c 80-50 BC, includes the astronomical computer, the Antikythera mechanism
* "Mary Rose", 1545
* "Vasa", 1628 discovered by Anders Franzén
* VOC ship "Batavia", 1629
* French explorer La Salle's ship "La Belle", 1686
* VOC ship "Amsterdam", 1749
* [http://www.qm.qld.gov.au/features/pandora/ HMS "Pandora" ] 1791
* "Medusa" 1816
* [http://members.aol.com/Shipwrks/Index.html/ "Georgiana"] 1863, most powerful Confederate cruiser, was lost with million dollar cargo on maiden voyage, Charleston, SC, wreck discovered by Dr. E. Lee Spence in 1966.
* "Hunley" 1864, first submarine in history to sink a ship, Charleston, SC, wreck 1st reported as discovered by Dr. E. Lee Spence in 1970. Wreck (at Spence at location Spence filed with National Park Service) was independently verified to be "Hunley" by 1994/95 NUMA/SCIAA expedition directed by Dr. Mark M. Newell and funded by novelist Clive Cussler.
* RMS "Titanic", 1912 discovered by Dr. Robert Ballard
* "Bismarck", 1941 discovered by Dr. Robert Ballard
* USS Arizona, 1941

Famous wrecksites

* Ancient & refugee ships of the Baltic Sea
* German High Seas fleet of Gutter Sound in Scapa Flow
* Truk Lagoon
* Pearl Harbor
* Takashima island off the Japanese coast of Kyūshū in the East China Sea
* Monte Cristi Pipe Wreck off the coast of Santo Domingo

Footnotes

External links

* [http://www.LAMPmaritime.org Lighthouse Archaeological Maritime Program (LAMP), St. Augustine Lighthouse and Museum, St. Augustine, Florida]
* [http://www.science.ulster.ac.uk/cma/ Centre for Maritime Archaeology, University of Ulster, Coleraine]
* [http://www.shipwrecks.uk.com Shipwrecks UK] : information on wrecks in the seas surrounding Britain and Ireland
* [http://www.thesextant.org/ The Sextant] , Online community of Underwater Archaeology and Maritime History
* [http://www.shipwrecks.com/ethics_in_underwater_archaeology.htm/ Sea Research Society] Ethics in Underwater Archaeology and Socialism versus Capitalism in Underwater Archaeology by Dr. E. Lee Spence
* [http://ina.tamu.edu/ Institute of Nautical Archaeology]
* [http://www.maritimehistory.org/ Institute of Maritime History]
* [http://www.abc.se/~pa/uwa/ Nordic Underwater Archaeology]
* [http://ehlt.flinders.edu.au/archaeology/welcome/maritime.php Flinders University Maritime Archaeology Program]
* [http://www.aima.iinet.net.au/home/aimaethic.html A Code of Ethics for Maritime Archaeologists by Australian AIMA]
* [Richard Stillwell, ed. "Princeton Encyclopedia of Classical Sites", 1976:] Richard Stillwell, ed. "Princeton Encyclopedia of Classical Sites", 1976:] "Shipwrecks" Includes alphabetized list of known wreck sites from Classical Antiquity.