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Divers to excavate mystery wall on Plymouth seabed

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Divers are getting ready to excavate a wall on the seabed off the Plymouth coast in Devon in the UK which is thought to have been buried for thousands of years.

The 570m-long bolder wall is thought to have originally been put in place to protect the southern end of Jennycliff Bay from rising sea levels.

The origins of the wall are unknown, but initial investigations show it has a structure similar to that of a dry stone wall, suggesting it wall may have been man-made.

Peter Holt, project manager for the SHIPS (Shipwrecks and History In Plymouth Sound) group, said: “Thousands of years ago the sea level in the English Channel was much lower than it is today. Plymouth Sound would have been dry land and the river Tamar would cut across the valley and out to sea. When sea levels rose the Sound would have been slowly flooded, so the wall may have been built to protect what was dry land in Jennycliff Bay.”

The wall, which is 1.5 metres tall, runs north to south across the bay, and divers are preparing to dig trenches in the seabed to get more detailed information.

They will be working from the local dive boat Maid Maggie, which will be anchored over the site.

Mr Holt said: “The wall is partly buried on the deeper side because the Sound has partly silted up since the wall was been built, so the divers will excavate down this side of the wall to confirm that it does continue under the sand.

“On the shallow side the seabed has filled in up to the top of the wall, so trenches will be dug to find out the wall’s shape on this side.

“Samples of the sediment from the trenches will be taken at different depths and will be taken back to Plymouth University for analysis that may provide a date when the structure was built.”

The SHIPS project started in 2009 to investigate the maritime history of Plymouth and its estuaries. For more information about SHIPS, click here.

 

Source: www.plymouthherald.co.uk

Marine Life & Conservation

The Big Shark Pledge: Shark Trust’s new campaign kicks off with a call for support

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With the ink still drying on last week’s landmark listing of nearly 100 species of sharks on Appendix II of CITES, the Shark Trust insists that this is not the time for shark conservation to take a break. The UK-based NGO this week launches its biggest-ever concerted campaign to tackle the overfishing of oceanic sharks. They are calling on people across the world to join the call for stricter controls on high seas fisheries.

The Big Shark Pledge is at the heart of an ambitious set of campaign actions. Working to secure science-based catch limits on all sharks and rays affected by the international high seas fishing fleet. The pledge will build the largest campaigning community in shark and ray conservation history to support a raft of policy actions over the vital years ahead.

Many of our best known and much-loved sharks make their home on the high seas. In our shared ocean, these oceanic sharks and rays face a very real threat from a huge international fleet of industrial-scale fishing vessels. Research published in early 2021 confirmed that over three-quarters of oceanic sharks and rays are now at risk of extinction due to the destructive impact of overfishing. They have declined by 71% over the last 50 years.

The Shark Trust is celebrating its 25th Anniversary this year and has a long history of securing positive changes for sharks, skates and rays. The Big Shark Pledge will build on the success of their NoLimits? campaign which underpinned landmark catch limits on Blue Sharks and Shortfin Mako in the North Atlantic.

While the listing of so many species on the CITES trade agreement is certainly a positive step, there remains a huge challenge in ensuring that sustainable practices are embedded in international fisheries.” says Shark Trust Director of conservation, Ali Hood. “Sharks on the high seas face extraordinary pressure from excessive fishing practices. This has to be addressed through international agreements such as those secured for Blues and makos.”

There is hope and a feeling of momentum in the shark conservation community. Just last week, in addition to the new CITES listings, the Shark Trust, working with partners in the Shark League, secured the first-ever international quota for South Atlantic Mako at ICCAT meeting in Portugal. The new campaign from the Shark Trust aims to push forwards from here, engaging a wave of support through the Big Shark Pledge to bolster policy action.

This will be a long-term international and collaborative effort. Forging a pathway to rebuild populations of high-seas sharks and rays. By putting science at the heart of shark conservation and fisheries management. And making the vital changes needed to set populations on the road to recovery.

Shark Trust CEO Paul Cox says of the Big Shark Pledge “It’s designed to give everyone who cares about the future of sharks the chance to add their voice to effective and proven conservation action. By adding their name to the Pledge, supporters will be given opportunities to apply pressure at key moments to influence change.

Click here to sign the Big Shark Pledge

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Miscellaneous Blogs

Jeff chats to… Craig Waller, Underwater Lighting Technician on Black Panther: Wakanda Forever (Watch Video)

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In this exclusive Zoom interview, Jeff Goodman, Scubaverse Editor-at-Large, chats to Craig Waller, Underwater Lighting Technician on Black Panther: Wakanda Forever. Craig is a Key Grip and Lighting Director with 10,000s of hours of Set Experience.

In Craig’s own words:

I started my career when I was in my first year of college.  I always had that creative side of the brain that needed to be followed as a career.  I thought that would be in designing engineering pieces but wasn’t happy about the idea of an office cubicle and drafting table.

I accidentally found my way onto a big commercial job for a week and decided “THIS IS WHAT I WANT TO DO”.   I made it my career after that. This is a quick list of recent and big projects in my 35 yrs of TV / Film / Photography.

Most Recently:

  • “Black Panther 2” – UW Lighting Technician / 2nd Unit Underwater Team
  • “Stranger Things” Season 4 – UW Lighting Technician / 2nd Unit Underwater Team
  • “Suicide Squad 2” – UW Gaffer / 2nd Unit Underwater Team
  • NASCAR / FOX Sports 1 – Network TV Lighting Director – 7 years / 700 races of Live BIG track TV shows
  • 10,000s of commercials / music videos / tv shows

I started diving when I was 18 years old with my OW and then AOW with PADI. I was diving with lots of friends in the late 80s and early 90s and then moved onto Kayaking. I got my daughter into diving when she turned 14 and have picked up where I left off.

I have approx 5000 dives now and spend most of my free time diving.

Here are my certs:

  • OW – AOW 1989
  • Adv Nitrox / Deco 2020
  • Cavern – Intro Cave 2021
  • CCR Tech – Fathom – 2021

You can find out more at www.craigwaller.com


Rather listen to a podcast? Listen to the audio HERE on the new Scubaverse podcast channel at Anchor FM.

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