The firm said studies by the Swedish National Heritage Board have indicated that at least nine of the twelve findings are of "great cultural historical value" and "well preserved".
The oldest wreck probably dates back to medieval times and could be up to 800 years old, while the others are likely from the 17th to 19th centuries, the Associated Press reported.
The heritage board said three of the wrecks have intact hulls and are lying upside-down at a depth of 130 metres (430 feet).
Thousands of wrecks — from medieval ships to warships sunk during the world wars of the 20th century — have been found in the Baltic Sea, which doesn't (yet) have the ship worm that destroys wooden wrecks in saltier oceans.
The latest discovery was made during a search of the seabed east of the Swedish island of Gotland by the Nord Stream consortium, which is building a 750-mile (1,200-kilometer) pipeline in the Baltic Sea.
The 12 wrecks were found in a 30-mile-long and 1.2-mile-wide (48-kilometer-long and 2 kilometer-wide) corridor, during underwater investigations conducted by the Swedish marine survey company Marin Mätteknik.
In a statement, the company said: "The findings are a result of the extensive seabed surveys carried out by Nord Stream as part of the preparatory works ahead of the construction of Nord Stream’s gas pipelines."
The wrecks were found in so-called anchoring corridor used for anchor positioning by the pipelay barge during the construction of the pipelines
"During the entire preparation phase Nord Stream has been working in close contact with the relevant Swedish authorities. The documentation concerning the shipwrecks has been made available to the National Maritime Museums, which are now preparing a final report based on the survey documentation," the company added.
"Analyses so far indicate that at least nine of the twelve findings are of great cultural historical value and thus also well preserved. The authority will now proceed to register the shipwrecks as permanent ancient monuments.
"Most of them are commercial ships, originating from the 18th and 19th centuries. However, the most ancient wreck could be from the Middle Ages.
"The discovery of the shipwrecks is another example of how Nord Stream’s extensive investigations of the Baltic Sea are useful for researchers as well as the interested public."
1 comment:
Breakdown Inspection of Material during Yacht repair Inspection.
There are different types of materials used in structures and how structures are put together to resist the forces. All of the above has been based on the supposition that the materials remain and function in accordance with their normal properties. However, in practice all materials are subject to degradation over time from a variety of different sources. some examples of materials used for yachts noted in their several years of experience by constellation marine inspectors are as under:-
Wood and dhows Repair Inspection.
Timber that has been well seasoned and that is kept in a uniform state of moisture (neither too wet nor too dry) when properly ventilated will remain stable and with no significant degradation for many hundreds of years. However, as a naturally occurring material, wood has naturally occurring enemies which come in the form of fungus (mould), worms and beetles which need to be inspected carefully.
Common Rot noticed by constellation marine surveyors during detailed Yacht/Boat condition inspection and surveys.
This is manifested by the presence of external yellow spots on the ends of the timber and is often accompanied by yellowish dust especially where the pieces of timber are in contact. The main cause is poor ventilation of the timber.
What is Wet Rot and how significant is it to be noticed during Yacht repair inspection?
Moisture, especially in the presence of warmth, will dissolve out some of the constituents of the cell walls and thereby cause decay. However, timber kept constantly immersed in water may soften but does not, in general, decay. It is the cyclical nature of wetting and drying that does the damage.
- See more at: http://www.marinesurveyordubai.com/yacht-repair-inspection-dubai/#sthash.cSi1z6K7.dpuf
- See more at: http://www.constellationms.com/marine-surveyor-dubai
Post a Comment