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NUPG April Meeting Report

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This month Alex Tasker gave us an insight into photogrammetry and his journey so far using this technique underwater.

Our usual focus at NUPG is capturing the beautiful scenes we see underwater in 2D, so turning these images into something in 3d so you can move around an object or underwater area on your laptop is a different concept and style of photography. Alex explained some of the history and theory of how this works and explained how he first got interested in this style of photography.

The historical side of things took us back to the thousands of images taken from spitfires in WW2 and the intelligence techniques that spotted the V2 rocket project. Alex’s own journey with photogrammetry first started with East Cheshire Sub Aqua Club’s Highball project and their aim to create a 3d model of one of the highball bombs in Loch Striven to allow non-divers to see what we are able to visit.

The theory started off making things sound relatively easy. The aim is to take lots of overlapping photographs of the subject from different angles. If there’s enough overlap each photograph has common points which the software can identify. The software can use both stills and video (by extracting individual frames from the video) and has the potential to use images from multiple sources to create the final 3d model, so the options on what camera to use are wide. After identifying the points in each image that match those in another image in the set and passing through multiple phases the software (hopefully) pops out a 3d model.

Alex’s first attempt was encouraging, on our ‘NUPG warm-up’ day in Capernwray last year he took hundreds of photos of Thunderbird 4 and produced a good 3d model (he obviously had 2 very patient buddies). Taking the photos that allowed this first attempt to work seemed easy, there was plenty of natural light and good visibility, the lesson learnt on this particular occasion was more about the patience required waiting for a laptop to process the images (or grind to a halt as the case may be). With the aim of the highball in mind though he needed to target objects in bad visibility, leading to trips to other well-known quarries where bad visibility and gloom are more readily found and an attempt to get a model of the hydrobox at Stoney Cove. The visibility on that occasion was so bad that the software thought some of the ‘muck’ in the water was actually part of an object and attempted to make it part of the model! This experiment also highlighted the challenges of getting images aligned, in bad visibility you need more overlap. The resulting model worked well for the top of the hydrobox but not the sides unfortunately. As with any form of photography though, practise is the key, so I’m sure another trip to the hydrobox will be on the cards this year.

At the beginning of March, Alex headed to Vobster Quay for a weekend to take part on the IANTD Photogrammetry course run by Tim Clements. He thoroughly enjoyed the course and got to pick up some tips from the likes of Simon Brown and Marcus Blatchford, who have a wealth of experience on this subject and have produced some amazing models (including entire wrecks and models that combine both underwater and drone photography). The course also got Alex thinking about the use of ‘angel lighting’. He’d been using his regular camera for the stills and attaching a video camera to the rig to collect additional data, having strobes and video lights on the same rig did add complications. By having his buddy carry the video lights it made using the video camera easier as a backup, gave his regular camera a better chance to focus and helped him easily know exactly where to find his buddy (not to mention giving his buddy something to do so she doesn’t get bored!)

Getting the images for photogrammetry is something any of us could do with our existing cameras. The challenges then become the amount of data generated from those images and the amount of processing power needed to turn them into a 3d model. There’s an amazing amount can be achieved by doing this though, from creating models of coral reefs to showing non-diving experts details of underwater wrecks. It will be interesting to see where his journey takes him over the coming months.

Winner by Justin Beevor

The monthly competition theme was Cephalopods. We had an array of fantastic images; the overall winner was Justin Beevor’s coconut octopus. Congratulations also go to Glynn Phillips whose octopus shot came in 2nd, and Maggie Russell who took 3rd place with a nicely isolated squid and also won the Compact category with her octopus entry.


The next NUPG meeting will be on Monday 13th May. This meeting will include talks by Roisin Maddison and Donovan Lewis on Videography and Sharks, as well as the NUPG AGM. The competition theme is “Action”.

For more information about the NUPG please visit their website by clicking here.

The Northern Underwater Photography Group (NUPG) is an organisation of like-minded people with an interest in taking images underwater. The group meets in Manchester but membership is drawn from around the North of England and further afield. Meetings are monthly and previous speakers have included Alex Mustard, Martin Edge, Alex Tattersall, and Scubaverse's own Nick & Caroline Robertson-Brown. Find out more at www.nupg.org.uk

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Northern Red Sea Reefs and Wrecks Trip Report, Part 3: The Mighty Thistlegorm

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red sea

Jake Davies boards Ghazala Explorer for an unforgettable Red Sea diving experience…

Overnight, the wind picked up, making the planned morning dive a bit bumpy on the Zodiacs to the drop point on Thomas Reef. There, we would dive along the reef before descending through the canyon and then passing under the arch before ascending the wall with a gentle drift. The site provided great encounters with more pelagic species, including shoals of large barracuda, tuna, and bigeye trevally.

Once back on the boat, it was time to get everything tied down again as we would head back south. This time, with the wind behind us, heading to Ras Mohammed to dive Jackfish Alley for another great gentle drift wall dive before then heading up the coast towards the Gulf of Suez to moor up at the wreck of the Thistlegorm. This being the highlight wreck dive of the trip and for many onboard, including myself, it was the first time diving this iconic wreck. I had heard so much about the wreck from friends, and globally, this is a must on any diver’s list. Fortunately for us, there was only one other boat at the site, which was a rarity. A great briefing was delivered by Ahmed, who provided a detailed background about the wreck’s history along with all the required safety information as the currents and visibility at the site can be variable.

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Kitting up, there was a lot of excitement on deck before entering the water and heading down the shoreline. Descending to the wreck, there was a light northerly current which reduced the visibility, making it feel more like the conditions that can be found off the Welsh coast. At 10m from the bottom, the outline of the wreck appeared as we reached the area of the wreck which had been bombed, as our mooring line was attached to part of the propeller shaft. Arriving on deck, instantly everywhere you looked there were many of the supplies which the ship was carrying, including Bren Carrier tanks and projectiles that instantly stood out.

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We headed around the exterior, taking a look at the large propeller and guns mounted on deck before entering the wreck on the port side to take a look in the holds. It was incredible to see all the trucks, Norton 16H, and BSA motorcycles still perfectly stacked within, providing a real snapshot in time.

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Overall, we had four dives on the Thistlegorm, where for all of the dives we were the only group in the water, and at times, there were just three of us on the whole wreck, which made it even more special, especially knowing that most days the wreck has hundreds of divers. Along with the history of the wreck, there was plenty of marine life on the wreck and around, from big green turtles to batfish, along with shoals of mackerel being hunted by trevally. Some unforgettable dives.

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The final leg of the trip saw us cross back over the Suez Canal to the Gobal Islands where we planned to stay the night and do three dives at the Dolphin House for the potential of sharing the dive with dolphins. The site, which included a channel that was teeming with reef fish, especially large numbers of goatfish that swam in large shoals along the edge of the reef. These were nice relaxing dives to end the week. Unfortunately, the dolphins didn’t show up, which was okay as like all marine life they are difficult to predict and you can’t guarantee what’s going to be seen. With the last dive complete, we headed back to port for the final night where it was time to clean all the kit and pack before the departure flight the next day.

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The whole week from start to finish on Ghazala Explorer was amazing; the boat had all the facilities you need for a comfortable week aboard. The crew were always there to help throughout the day and the chefs providing top quality food which was required after every dive. The itinerary providing some of the best diving with a nice mixture of wreck and reef dives. I would recommend the trip to anyone, whether it’s your first Red Sea liveaboard in the Red Sea or you’re revisiting. Hopefully, it’s not too long before I head back to explore more of the Red Sea onboard Ghazala Explorer.

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To find out more about the Northern Red Sea reef and wrecks itineraries aboard Ghazala Explorer, or to book, contact Scuba Travel now:

Email: dive@scubatravel.com

Tel: +44 (0)1483 411590

www.scubatravel.com

Photos: Jake Davies / Avalon.Red

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Northern Red Sea Reefs and Wrecks Trip Report, Part 2: Wall to Wall Wrecks

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red sea

Jake Davies boards Ghazala Explorer for an unforgettable Red Sea diving experience…

The second day’s diving was a day full of wreck diving at Abu Nuhas, which included the Chrisoula K, Carnatic, and Ghiannis D. The first dive of the day was onto the Chrisoula K, also known as the wreck of tiles. The 98m vessel remains largely intact where she was loaded with tiles which can be seen throughout the hold. The stern sits at 26m and the bow just below the surface. One of the highlights of the wreck is heading inside and seeing the workroom where the machinery used for cutting the tiles are perfectly intact. The bow provided some relaxing scenery as the bright sunlight highlighted the colours of the soft coral reef and the many reef fish.

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Following breakfast, we then headed to the next wreck, which was the Carnatic. The Carnatic is an 89.9m sail steamer vessel that was built in Britain back in 1862. She ran aground on the reef back in 1869 and remains at 27m. At the time, she was carrying a range of items, including 40,000 sterling in gold. An impressive wreck where much of the superstructure remains, and the two large masts lay on the seafloor. The wooden ribs of the hull provide structures for lots of soft corals, and into the stern section, the light beams through, bouncing off the large shoals of glass fish that can be found using the structure as shelter from the larger predators that are found outside of the wreck.

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The final wreck at Abu Nuhas was the Ghiannis D, originally called ‘Shoyo Maru,’ which was 99.5m long and built in Japan back in 1969 before becoming a Greek-registered cargo ship in 1980. The ship then ran aground on the reef on April 19th, 1983, and now sits at the bottom at a depth of 27m. Heading down the line, the stern of the ship remains in good condition compared to the rest of the hull. The highlight of the wreck, though, is heading into the stern section and down the flights of stairs to enter the engine room, which remains in good condition and is definitely worth exploring. After exploring the interior section of the ship, we then headed over to see the rest of the superstructure, where it’s particularly interesting to see the large table corals that have grown at the bow relatively quickly considering the date the ship sank. After surfacing and enjoying some afternoon snacks, we made sure everything was strapped down and secured as we would be heading north and crossing the Gulf of Suez, where the winds were still creating plenty of chop.

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The next morning, it was a short hop to Ras Mohammed Nature Reserve for the next couple of days of diving. The 6am wake-up call came along with the briefing for the first site we would be diving, which was Shark & Yolanda. The low current conditions allowed us to start the dive at Anemone City, where we would drift along the steep, coral-filled wall. These dives involved drifts, as mooring in Ras Mohammed wasn’t allowed to protect the reefs. As a dive site, Shark & Yolanda is well-known and historically had a lot of sharks, but unfortunately not so many in recent years, especially not so early in the season. However, there was always a chance when looking out into the blue.

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The gentle drift took us along the steep walls of the site, with plenty of anemone fish to be seen and a huge variety of corals. It wasn’t long into the dive before we were accompanied by a hawksbill turtle, who drifted with us between the two atolls before parting ways. Between the two reefs, the shallow patch with parts of coral heads surrounded by sand provided the chance to see a few blue-spotted stingrays that were mainly resting underneath the corals and are always a pleasure to see. With this being the morning dive, the early sunlight lit up the walls, providing tranquil moments. Looking out into the blue, there was very little to be seen, but a small shoal of batfish shimmering underneath the sunlight was a moment to capture as we watched them swim by as they watched us.

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Towards the end of the dive, we stopped at the wreck of the Jolanda where the seafloor was scattered with toilets from the containers it was carrying. This provided a unique site to make a safety stop, which was also accompanied by a large barracuda slowly swimming by, along with a hawksbill turtle calmly swimming over the reef as the sun rays danced in the distance.

For the next dive, we headed north to the Strait of Tiran to explore the reefs situated between Tiran Island and Sharm El Sheik, which were named after the British divers who had found them. We started on Jackson before heading to Gordons Reef, where we also did the night dive. All the atolls at these sites provided stunning, bustling coral reefs close to the surface and steep walls to swim along, which always provided the opportunity to keep an eye out for some of the larger species that can be seen in the blue. Midwater around Jackson Reef was filled with red-toothed triggerfish and shoals of banner fish, which at times were so dense that you couldn’t see into the blue. Moments went by peacefully as we enjoyed the slow drift above the reef, watching these shoals swim around under the mid-afternoon sun.

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The night dive at Gordon’s Reef was mainly among the stacks of corals surrounded by sand, which was great to explore under the darkness. After some time circling the corals, we came across what we were really hoping to find, and that was an octopus hunting on the reef. We spent the majority of the dive just watching it crawl among the reef, blending into its changing surroundings through changes in colour and skin texture. It’s always so fascinating and captivating to watch these incredibly intelligent animals, in awe of their ability to carry out these physical changes to perfectly blend into the reef. Before we knew it, it was time to head back to the boat to enjoy a well-deserved tasty dinner prepared by the talented chefs onboard.

Check in for the 3rd and final part of this series from Jake tomorrow!

To find out more about the Northern Red Sea reef and wrecks itineraries aboard Ghazala Explorer, or to book, contact Scuba Travel now:

Email: dive@scubatravel.com

Tel: +44 (0)1483 411590

www.scubatravel.com

Photos: Jake Davies / Avalon.Red

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