Maritime Archaeology Updates

Diving Deeper with the Maritime Archaeology Trust

Tag: photography

Menhir de la Tremblais

Near the village of Saint-Samson-sur-Rance, in Brittany, France, we find this interesting Neolithic piece of stone.

Pierre Longue menhir of Thiemblaye

The menhir stands alone at 6 meters in length, leaning at just over  45 degrees. It is a large block of granite and quartz, with a relatively polished, flat look.

Most of the time that is all it seems to be. However, when the sun hits it just right, beautiful markings and carvings appear. Carvings of crosses, leaves, axes, waves and various animals.

 

There are several legends surrounding this monument. One legend says it is one of three stones closing the entrance to hell. This belief gave it the name “Bonde de l’Enfer,” loosely meaning “Leap From Hell.”

Another legend says that a young girl who wants to get married should climb on top of the menhir and slide down in her “birth pants.” Subsequently, she will be wed within a year.

A final legend tells a story of Samson of Dol who faced the temptations of the Devil nearby, and when the Devil failed, it whipped the stone, creating some of the marks we can see today.

 

 

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Forgotten Wrecks of the Devon Coast: Geophysics and Diving

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Distribution of First World War wrecks within the Devon study area (image credit: Contains public sector information, licensed under the Open Government Licence v2.0, from the Maritime and Coastguard Agency).

As part of the Forgotten Wrecks project this summer the Maritime Archaeology Trust sent out a team of divers to find and document a number of WW1 wrecks off the South Devon Coast. In order to assist the divers in finding these wrecks bathymetric maps were consulted. Much like navigational charts used by mariners these maps show the topographic features of the seafloor. However, modern techniques such as multibeam bathymetry, paint a far higher resolution image of the seafloor with measurements made every few metres.  As a result, even fine details such as the orientation of shipwrecks and the positions of larger objects such as boilers and anchors on these sites, can be seen.

Within the area surveyed by the Maritime Coastguard Agency between 2012 and 2015 (data freely available from aws2.caris.com) 31 of the 48 wrecks which had been identified as lying within the south Devon study area reviewed ahead of diving operations were visible.

Once identified a zoomed in map was created of each wreck. The examples shown here are of the British Navy trawler, the Benton Castle and cargo ship, the Newholm. Both of which sank after hitting mines, leading to the loss of 30 lives in total. These images and images of the other wrecks were used by the diving team to help select individual sites to dive and then plan their dives more effectively.

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Geophysical survey image of the Benton Castle (image credit: Contains public sector information, licensed under the Open Government Licence v2.0, from the Maritime and Coastguard Agency).

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Geophysical survey image of the Newholm (image credit: Contains public sector information, licensed under the Open Government Licence v2.0, from the Maritime and Coastguard Agency).

The dive team operated out of Dartmouth using Falcon Diving Charters (http://falcondivingcharters.com/) during the week of 27th June to the 1st July. Despite some challenging weather conditions the team managed to reach a number of the Forgotten Wrecks to undertake survey and photogrammetric recording.

Written by Amelia Astley

To find out more about the Forgotten Wrecks of the First World War project, click here.

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Diver photographs detail of the wreck structure of the Newholm.

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Marine life encrusts the remains of the wreck of the Benton Castle.

 

Bouldnor Cliff: A World Class Site

Mohamed Ziad

Mohamed and Ziad

Bouldnor Cliff isn’t just important from a British perspective: it is a unique site that interests people from all over the world! The diving team included archaeologists from the Maritime Archaeology Trust and even two divers who’d traveled all the way from Egypt to help with the work and see the remains of the Mesolithic settlement. Ziad and Mohamed flew to Britain when volunteers were needed to join the Bouldnor Cliff survey, and came to help with the photogrammetry work around the site. They’ve done work all around the world, including in Montenegro, Lebanon, Egypt and Italy, but this was their first time diving in the U.K.

Ready for that renowned British summer, Ziad and Mohamed joined the team on the boat, keen to explore the famous site. Undeterred by the wind and rain of the first day (it is summer, after all), they were ready to get stuck in and brave the chilly Solent. Layered up and as prepared as can be for the colder climate they jumped in to get to work. The cold was no match for their enthusiasm and they worked hard, familiarising themselves with the site and the new conditions.

And what did they have to say after their first dive? Ziad had only one word: ‘challenge’!

Now used to the cold and the weather, they carried on diving on the site, contributing hundreds of photos to the photogrammetric survey, and taking footage on a GoPro. Their dedication is such that the skipper even poured warm water into their wetsuits before a dive! Inspired by Ziad’s one-word summary, Mohamed described the site as an ‘adventure’.

Ziad and Mohamed aren’t the only members of the #SaveBouldnor team from abroad – Sarah is from the United States, and Miguel is a PhD student from Lisbon, Portugal. Sarah works at the Maritime Archaeology Trust, and considers the site to be ‘groundbreaking’!

Miguel came to Bouldnor Cliff to gain experience in a new environment, and to improve his skills in 3D reconstruction and recording. Miguel described the site as ‘exciting’ and has contributed a lot of work to the photographic record.

It’s not just maritime archaeologists who find Bouldnor Cliff fascinating – Andy has worked closely with the Trust for fifteen years. He finds the site ‘remarkable’, and, as a long-time diving enthusiast, is helping out on-site.

Bouldnor Cliff is a special site that is always turning up new information and fascinating artefacts. It has something of interest for people from all over the world, from different backgrounds, and this multi-national team has come together to work to save Bouldnor, and learn its secrets. Work like this is invaluable, and will contribute to the continuing record of Bouldnor Cliff, as the MAT monitor the site’s condition and explore new features.

Bouldnor Cliff Day One: 14/06/16

The MAT Bouldnor Cliff dive team 2016

Just off the Isle of Wight is the site of Bouldnor Cliff. Bouldnor Cliff was a Mesolithic settlement, dating to 8,000 years ago. The finds from this site include worked timber and flints, and show that the inhabitants were using technology that was 2,000 years more advanced than expected in a site of this age!

The Mesolithic site is about eleven metres below the surface, and is part of the Solent Maritime Special Area of Conservation. Sadly, the tides of the Solent are eroding the site. More material is constantly being exposed, and subsequently is being threatened. The Maritime Archaeology Trust is working hard to monitor the site’s condition, and to recover material that is coming under threat.

The MAT is carrying out dives to create a record of the site, to document any changes that are taking place, and any exposed material. It is important to make frequent records of the site, and the plan is to use photogrammetry to create a 3D model. Divers first make a ‘pre-disturbance survey’, in order to ensure that the site is properly catalogued before making and changes or disturbing anything. Once the researchers are confident that there is a good record of the site and its contents, they are able to examine and rescue artefacts, and bring them to the surface for further study. These can be compared with the plan, in order to make note of where the artefacts were find, and piece together the site: a bit like putting together a big puzzle.

The divers set up a baseline at the site, in order to carry out the recording. A photographic survey was undertaken, to record the newly exposed features and document the site in its current condition, before any further work.

The first thing seen by the divers as they approached the site was some newly exposed timber, protruding from the bank. This timber was not visible last year, and has been revealed by the erosion. It appeared to have been worked, and looks like it may even be the remains of a platform. Later dives will aim to further study these timbers, and rescue them.

A later dive revealed a fellow archaeologist digging at Bouldnor Cliff: a lobster, with a collection of worked flints outside his burrow. Lobsters are frequent visitors to the site, and often turn up flints such as these. With the lobster’s help, the next dive recovered five small worked flints, and they were brought to the surface and inspected for the first time in 8,000 years.

The first day was a grand success, with four dives in total. The last of these dives included two new visitors; volunteers from Egypt who had come to see the site and assist in the photogrammetry. They were very impressed with what they saw, and can’t wait to return to the site and continue their study. The work at Bouldnor Cliff will continue, to ensure that the site is safe, any threatened material is recovered, and that we learn everything we can from this exciting site.

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Garry Momber talks Bouldnor Cliff
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Identifying a Catalina

Consolidated_PBY-5A_Catalina_in_flight_c1942

In February we were contacted by a member of the public who’d recently enjoyed a trip to the Caribbean. Whilst there, he’d been diving off the island of St Lucia and visited the wreck of an aircraft. It was, he said, just inside a reef in shallow water but difficult to access as the waves break over the reef in windy weather.

He only had the one opportunity to visit and even then, could not explore the whole aircraft. With no information available from the team who guided him to the wreck, he was curious as to what it may be and, on his return to England, contacted us to see if we’d be able to help.

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Images courtesy of Alan Foster

His photos illustrate some of the difficulties in maritime archaeology – namely visibility and recording. Not only had the diver been unable to reach the rear of the aircraft, but they hadn’t even been able to see it. Additionally, it is very difficult for someone viewing the photographs later to gauge the scale of the wreck – which is exactly why scale rulers are so important in archaeological recording (not that we would expect a diver on a pleasure dive to take scales with them purely for our benefit!).

The query was sent through to the Trust’s military history expert, Stephen Fisher. At first it looked like a hopeless task as it was barely possible to work out what any part of the front of the aircraft the photographs were looking at, but Stephen was struck by a solitary feature, visible in the bottom left photograph. This strake reminded Stephen of a similar feature he had seen on the nose of the Consolidated PBY Catalina flying boat, a famous aircraft from the period of the Second World War.

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Working on this hypothesis, it didn’t take long to match up the other seemingly random features with the Catalina.

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Right hand photo by Aleksandr Markin [CC BY-SA 2.0], via Wikimedia Commons.

With the type of plane now known, it made identifying the actual plane a lot easier. The book BusNos!: Disposition of World War II USN, USMC and USCG Aircraft Listed by Bureau Number by Douglas Campbell lists two possible candidates:

  • Aircraft 2400 Consolidated PBY-5 Catalina (Naval Patrol Squadron 31) based at San Juan, Puerto Rico, reported as having ‘water looped during landing and sank 30-Apr-42 at St Lucia’.
  • Aircraft 7249, Consolidated PBY-5A Catalina (Naval Patrol Squadron 92) ‘force-landed after engine failure and drifted onto reef and sank 14-May-42 St Lucia.’

There were only minor differences between the 5 and 5A and because of the sheer number of individual variations, even between planes of the same model (such as the forward gun position), it wouldn’t be easy to tell one from the other based on the images. The description of Aircraft 7249 sinking on a reef obviously suggests it may be that one.

The diver has passed all of this information to his contacts in St Lucia. Further research and dives to identify this aircraft can now at least focus on two specific aircraft and look for clues as to which it may be.

With thanks to Alan Foster.