Barangaroo Boat excavation. Image: Renee Malliaros/Silentworld Foundation for Sydney Metro, 2018.

Finding the Barangaroo Boat

Like a boat on land – musings of a maritime archaeologist on the Barangaroo Boat (terrestrial) dig

‘Want to come along and check out this boat they found at Barangaroo?’
Little did I know where my answer would eventually lead!

Visting Barangaroo

A clear sunny morning in October 2019, promising a sweaty sort of day, saw us meeting up with our colleagues at the Australian National Maritime Musem (ANMM) for a saunter around Darling Harbour to Barangaroo.

Barangaroo is named after an aboriginal woman of the Cammeraygal clan, part of the Eora language group. Her second husband was Bennelong, after whom Bennelong Point is named, the site upon which the Sydney Opera House sits. Barangaroo was a proud defender of aboriginal Australian culture and the land to which she was deeply connected. You can learn more about this fascinating personality of the early colonial period here.

The excavation director Cos Coroneos, of Cosmos Archaeology, met us at the gate to the Sydney Metro Barangaroo Station construction site to grant us entry and be our guide.

Close up shot of trowels resting on the timbers of the Barangaroo Boat during excavation. Image: Renee Malliaros/Silentworld Foundation for Sydney Metro, 2018.

Clapping eyes on the excavation site for the first time revealed the hull of a boat, slick with water and mud as the excavating archaeologists buzzed around it, revealing more and more of its form with every scoop of sediment they lifted and tossed into their bucket.

Cos recounted the events of its discovery and the excavation process to date, as well as the preliminary observations and results of timber analysis (for more information see here). The boat was constructed of timber from only Australian tree species. Its context and construction seemed to point to an early date (c. early 1800s), perhaps making it the earliest European Australian boat to be found and excavated!

Trowel time

Handed a trowel, we were permitted to have a bit of a scrape at some of the edges – for maritime archaeologists who spend most of their time floating around underwater, this was quite a different experience. Before we cleared out of the area to allow the archaeologists to get on with their day excavating the (potentially) oldest colonial boat, Cos casually asked: ‘Do you think you might want to join and help us on site?’

This was met with a resounding yes by the entire visitor team – especially after that incredible and hands-on introduction to what was looking to be a very special find.

At the kind and official invitation from Casey & Lowe and Cosmos Archaeology, and the correct certification and clearance for working on the construction site, we spent several surreal weeks on the dig. Slotting into the daily routine, I was able to assist with:
• digging
• sediment sifting
• timber recording
• photography
• packing

Once the executive decision was made that the safest option of removal from site was to disassemble the boat, the processing line took shape. Slowly, this rare little boat was carefully taken apart and, under the instruction of conservators from ICS, its individual timbers were wrapped, secured in place within wooden boxes using custom brackets to preserve their ‘as found’ shape and put into refrigeration at 4°C.

An unassuming boat, with many questions to explore

While on-site (and still to this day), it often crossed my mind what the builders of this boat and those who used it throughout its life might think and say when they saw us treating their little ‘run-about’ with such reverence?

Painstakingly excavating it, packing it and carrying its pieces across the construction site to a refrigerated refuge under the hot sun, with the dust clinging to our clothes and the mud staining our hands. Would they have laughed?

Would they have comprehended the great cultural significance it carries? Never in their life could they have guessed how important their little vessel would have been so many years later.

I look forward to all that we can learn from this unassuming boat – we intend to make the most of our chance meeting with it and ask as many questions of it as we can.

Stay on board and hold on to your hats – this is the first European Australian built boat, made with all Australian timber to ever be excavated, recorded in such high detail and fully conserved. It is going to be an exciting sort of ride.

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The Battle of Rhode Island

WHAT HAPPENED AFTER THE BRITISH SHIPS WERE SCUTTLED?

After the British intentionally sunk some of their ships in order to keep the French naval force at bay, the French Admiral Comte d’Estaing, brought his entire fleet into the harbour and landed his troops on the close by Conanicut Island. However, the British were expecting reinforcements by sea and, upon learning this, d’Estaing re-boarded his troops and headed out to meet the British fleet at sea lest he be cornered by a combined, and hence larger, British force. The two fleets met at sea but the battle was plagued by bad weather and seas causing both sides much damage and scattering their respective fleets.

The British made for their port of origin in New York for repairs while d’Estaing went back to Newport in order to inform his American allies that he would he departing for Boston to do the same. The Americans were outraged by this ‘desertion’ but d’Estaing had no choice but to seek repairs for his ships in a safe harbour.

The struggle between British and American forces on land continued until the Americans realised they could push the British no further back. They departed for Bristol soon after. The British, although successful in their defense, eventually abandoned Newport towards the end of 1779 and the French temporarily moved in until 1781.


Map of the position of the French army around Newport and the anchorage of the squadron in the harbor of this city.

This stylised map of the harbour and city of Newport in 1780 when the French temporarily occupied the city includes an indication of sunken vessels between Goat Island and Blue Rock, labelled ’57’. This number in the legend of the upper right corner of the map translates to:

Hulks of ships sunk to the bottom by the English on the approach of the Comte d’Estaing’s squadron in 1778.

French Naval HQ Newport 1780More Brief History of Newport

Source: Library of Congress; view here


THE COLOURS OF WRECKS

A work of fact by: Irini (Renee) Malliaros and Dr James Hunter (ANMM)

This past January, a collaborative research team comprising maritime archaeologists from the Silentworld Foundation and Australian National Maritime Museum conducted a shipwreck survey at Kenn Reefs in Australia’s Coral Sea Territory. The team relocated a number of historic shipwrecks documented by the Queensland Museum in the 1980s as well as four new wreck sites. The Kenn Reefs complex is a seamount system located within the ‘Outer Route’, a seaway used by nineteenth-century mariners in an effort to avoid the Great Barrier Reef when travelling to and from Australia’s east coast. The discovery of multiple shipwreck sites of nineteenth-century vintage at Kenn Reefs demonstrates the hazards faced by mariners as they transited through waters that were insufficiently charted. Field investigations included reef-top inspections, metal detector and magnetometer surveys and diver-based ground-truthing of observed features and buried anomalies.

(Cover: Three large anchors associated with the Dutch ship Hesther, wrecked at Kenn Reefs in 1854. The anchors & other large iron objects associated with the shipwreck are the source of dark discolouration of the reef that is visible in satellite imagery. Image: Julia Sumerling/Silentworld Foundation)

From the Archives.

According to archival sources, at least eight vessels are known to have wrecked at Kenn Reefs during the nineteenth century. These losses, and others at isolated reefs dotted throughout the ‘Outer Route’, eventually prompted British authorities to order an official geographic survey of Kenn Reefs in 1859. The survey, led by Royal Navy officer Henry Mangles Denham, resulted in the reef complex’s location being accurately plotted for the first time. Denham’s chart contains several notable features; foremost among them are the positions of five unidentified shipwrecks. All of these wreck site locales approximately correlate to the locations of archaeological sites recorded during the 1987 and 2017 surveys.

The Age of Digital.

Data collected  during both surveys has been integrated within a Geographic Information System (GIS) that allows the team to view the spatial arrangement of each shipwreck site, essentially providing a ‘bird’s eye view’ of the overall survey area. The presence of multiple historic shipwrecks within a relatively confined area—an attribute that exists at Kenn Reefs—often means cultural material from these sites is located in very close proximity, or even overlaps. This can lead to confusion, but a useful counter to the problem is GIS, which enables the user to build layers of data that allow for seamless integration of information. Datasets (and their respective metadata) that may be integrated within a GIS project include Global Positioning System (GPS) coordinates, satellite imagery, bathymetric survey data, aerial photographs, regular image files and contour maps. The collation of multiple data streams within a single digital management system provides a means to better analyse and interpret a given site or group of sites.

Satellite image of the southernmost reef in the Kenn Reefs complex, showing the locations of historic shipwreck sites relative to dark linear areas of discolouration. Image: Silentworld Foundation.

Upon superimposing GPS data over high-resolution satellite imagery, the team noticed obvious evidence of effect(s) wrought by historic shipwrecks on the reef crest (reef top) of the southernmost reef in the Kenn Reefs complex. It appears in the form of a large, dark linear stain oriented roughly north-to-south across the reef crest in direct association with the plotted position of every identified shipwreck site. Physical scouring of reef substrate is associated with the staining and clearly visible in satellite imagery. These scour zones likely resulted from the initial impact of the vessel’s hull on the reef and subsequent physical motion of it being pushed—in whole or in part—across the reef flat.  The stains, by contrast, seem to originate from large artefacts or features (e.g., anchors) manufactured from iron. The stains widen as they extend north towards the lagoon on the inside of the reef.

The phenomenon appears to have only occurred on the southernmost (and windward) section of Kenn Reefs, as it was not observed on any other part of the reef complex. It quickly became evident to the team that the combined staining and abrasion was indicative of historic shipwreck sites. Using these features as a guide, at least one other potential shipwreck has been identified via satellite imagery (although its identity was not visually confirmed during either the 1987 or 2017 survey).

Satellite image of Rose Atoll (American Samoa), showing ‘black reefs’ generated by the wreck of the modern fishing vessel Jin Shiang Fa.

Image: Google Earth/DigitalGlobe/NOAA.

Made of Iron.

Further research has revealed the staining is the result of a phenomenon described by marine scientists as ‘black reefs’. It has been observed at various sites of modern shipwreck or contemporary natural disaster, but its association with the former is not well studied and research is ongoing. The results of a study published by marine biologist Terry Done noted that apparent ‘staining’ of coral reefs is caused by a ‘phase shift’ in which a coral dominated system (inclusive of microalgae) is replaced by a predominantly (macro)algal one. There are several factors that may facilitate a phase shift and leaching of a shipwreck’s iron and iron-based components into the surrounding water appears to be one of them. Studies at modern shipwreck sites in 2008 and 2012 revealed that elevated levels of iron in solution promote prolific algal and corallimorph growth. Corallimorphs are an order of marine cnidarians closely related to stony or reef-building corals and typically feature a narrow column topped with a wide oral disc. The microbial activity associated with increased concentrations of algae and corallimorphs in turn eliminates corals and coralline algae. In the case of modern wrecking events, the type(s) of cargo and fuel(s) carried aboard a vessel may accelerate the phase shift process in the benthic community immediately surrounding the shipwreck site. This phenomenon was documented at Australia’s Myrmidon Reef in 1984 by marine ecologist Bruce Hatcher.

A WHAT SHIFT NOW?

(clicky to learn more about phase shifts)

Done has also explored the capacity for coral communities on an affected reef to ‘recover’ dependent upon environmental conditions. Anthropogenic and natural disturbances may limit or completely prevent a reef from recovering and also can affect its rate of recovery. The shipwreck sites at Kenn Reefs display healthy coral and coralline algae growth, even on large in situ iron artefacts. In fact, heavier more stable objects such as anchors provide a surface to which corals can attach, as well as a substrate for coralline algal growth. Some algal growth was noted on these shipwreck sites during the 2017 survey, but is not overtaking the existing coral community. Turf algae dominate the shipwreck sites located on the reef crest but new coral growth is clearly evident. Large sections of detached limestone rubble on the reef crest indicate there may be other factors limiting the rate of coral community establishment, including structural damage wrought by cyclones and other severe weather events.

Reef ‘recovery’ despite the presence of large iron artefacts has been noted at other historic shipwreck sites. In 1976, Neil North noted the absence of large corals during the excavation of the Dutch vessel Batavia (wrecked 1629), but also observed that coralline algae was found adhering to iron concretions. North attributed this trend to the site’s presence on the southern extremity of an actively growing coral reef, as well as the presence of favourable water conditions conducive to algal growth. He also noted that certain objects, such as bricks and iron markers placed on the site during fieldwork, were partly or completely covered by coralline algae in a matter of months. An iron mooring anchor used during the project was covered by a one centimeter-thick layer of coralline algae within three years.

Hard corals are becoming re-established on a number of large iron artefacts at Kenn Reefs, including this Porter-patent anchor. This suggests a possible reversal of the Black Reefs phenomenon at some historic shipwreck sites.

Image: Julia Sumerling/Silentworld Foundation.

Much to Learn.

The presence of ‘black reefs’ in association with historic shipwrecks is a line of inquiry that has never been investigated. Understanding a coral reef’s ability to recover from a phase shift event that occurred over a century ago has modern implications. For example, data derived from analysis of reefs affected by historic shipwrecks could be used to assess and/or predict reef rebound from recent or future shipwreck events. Comprehensive study of the phenomenon in association with older shipwreck sites may reveal information about reef damage following the initial wrecking event. Perhaps most importantly, it may also provide empirical data regarding the prolonged effects of iron-based material that has settled on the reef, as well as the potential for  reverse phase shifts and eventual recovery of affected benthic communities. Results stemming from this research could also prove beneficial in determining whether phase shifts are caused by other factors. This is of particular significance, given the stresses and threats coral reefs are currently facing worldwide.

The Silentworld/ANMM team also postulates that ‘black reefs’ may occur in association with historic shipwrecks at other locales and wish to pursue this line of inquiry to assess if it is a consistently repeatable phenomenon that can be used as a predictive model for locating shipwreck sites.

The Reading List

Done, T. J. (1992), Phase Shifts in Coral Reef Communities and Their Ecological Significance, Hydrobiologia 247(1): 121-132.

Hatcher, B. G. (1984), A Maritime Accident Provides Evidence for Alternate Stable States in Benthic Communities on Coral Reefs, Coral Reefs 3(4): 199-204.

Hatcher, B., Johannes, R. and Robinson, A. (1989), Review of the Research Relevant to the Conservation of Shallow Tropical Marine Ecosystems, Oceanography and Marine Biology 27: 337-414.

Kelly, L. W., Barott, K. L., Dinsdale, E., Friedlander, A. M., Nosrat, B., Obura, D., Sala, E., Sandin, S. A., Smith, J. E., Vermeij, M. J. A., Williams, G. J., Willner, D. and Rohwer, F. (2012), Black Reefs: Iron-induced Phase Shifts on Coral Reefs, The ISME journal6(3): 638-649.

North, N. (1976), Formation of Coral Concretions on Marine Iron, International Journal of Nautical Archaeology and Underwater Exploration 5(3): 253-258.

Schroeder, R. E., Green, A. L., DeMartini, E. E. and Kenyon, J. C. (2008), Long-Term Effects of a Ship-Grounding on Coral Reef Fish Assemblages at Rose Atoll, American Samoa, Bulletin of Marine Science 82(3): 345-364.