News
800 feet tall deep sea waves discovered in Pacific Ocean

They would be the ultimate in big wave surfing. Scientists have discovered waves that rise up to be taller than some sky scrapers.
However, rather than being found on sun kissed beaches in exotic locations around the world, these waves are three miles beneath the surface of the ocean.
Researchers found the waves, which are also known as internal waves, form at the boundary between two layers of water with different densities in a deep ocean trench in the South Pacific Ocean.
These form 800 foot waves that rear up and then plunge hundreds of feet down into the dense water on the other side of the sill. However, each wave takes around an hour to break.
So while it might never be possible for surfers to ride these enormous waves, the scientists say these waves play an important role for mixing nutrients in the ocean.
Professor Matthew Alford, an oceanographer at the University of Washington who led an expedition to the channel, known as the Samoan Passage, said: “Oceanographers used to talk about the so-called ‘dark mixing’ problem, where they knew that there should be a certain amount of turbulence in the deep ocean, and yet every time they made a measurement they observed a tenth of that.
“We found there are loads and loads of turbulence in the Samoan Passage, and detailed measurements show it’s due to breaking waves.”
The findings are published in the journal Geophysical Research Letters.
The layers of water form because dense cold water in Antarctica sinks into the deep Pacific Ocean and is forced through a 25 mile gap north east of Samoa.
Around six million cubic metres of water pass through the gap every second – around the same as 35 Amazon Rivers.
Dr Alford and his team lowered specially designed “wave chaser” instruments three miles to the seabed and took measurements over thirty hour periods of the turbulence at the boundary between the cold dense water and warmer water above.
They found that as the dense bottom layer of water flows over two consecutive ridges in the Samoan Passage, it causes them to form lee waves, like air rising over a mountain.
These become unstable and break, causing the dense cold water to mix with the upper layers.
Professor Alford said this helps to explain why dense cold water does not permanently pool at the bottom of the ocean.
The waves may also play a role in stimulating global currents.
They believe waves like this form at other locations in the Samoan Passage and elsewhere in the ocean.
At their most powerful, some internal waves can sweep submarines off course or cause them to sruface.
“In addition to the primary sill, other locations along the multiple interconnected channels through the Samoan Passage also have an effect on the mixing of the dense water.
“In fact, quite different hydraulic responses and turbulence levels are observed at seafloor features separated laterally by a few kilometres, suggesting that abyssal mixing depends sensitively on bathymetric details on small scales.
“Climate models are really sensitive not only to how much turbulence there is in the deep ocean, but to where it is.
“The primary importance of understanding deep-ocean turbulence is to get the climate models right on long timescales,” Alford said.
Professor Alford, who is a surfer himself, added that these deep sea waves would make for a dull surfing experience.
He said: “It would be really boring. The waves can take an hour to break, and I think most surfers are not going to wait that long for one wave.”
Photo: WaveChasers APL
Marine Life & Conservation
IUCN Spotlights Green Fins at Bali Ocean Days 2025, Calling for Stronger Business Model in Marine Conservation

IUCN (International Union for Conservation of Nature) Global Ocean Director, Minna Epps, has spotlighted Green Fins Indonesia along with a call for stronger business models that sustain marine conservation. Speaking at the inaugural session of Bali Ocean Days 2025 held on 7-8 February, Epps emphasised the need for sustainable financing to support and scale marine conservation initiatives such as Green Fins.
Activities earlier in the week with the Coral Triangle Center in Sanur and Ceningan Divers in the Nusa Penida Marine Protected Area shaped the IUCN Ocean Director’s message at the conference and showcase, aligning with the theme of the blue economy and impact finance to sustain marine ecosystems.
“Tourism has such a big impact on marine biodiversity, and we need it to adhere to a certain code of conduct,” Epps said. “That is why through our funding facilities, we worked with The Reef-World Foundation advancing Green Fins so dive operators can become certified with standards. But this kind of initiative has been around for a long time and it’s also a tool used to improve [MPA management], but it needs to come with a business model. I also believe in market-based instruments to evolve this programme.”
IUCN’s visit is part of their Blue Natural Capital Financing Facility (BNCFF), which supports at least 21 projects around the world, building the business case for investing in the future of our ocean.
In Indonesia, the project supported by IUCN was developed in partnership with The Reef-World Foundation, the Coordinating Body on the Seas of East Asia (COBSEA) and the Coral Triangle Center, which serves as the local implementing organisation for Green Fins. The initiative engages marine tourism businesses through voluntary sustainability certification based on the only internationally recognised environmental standards for diving and snorkelling operations. Green Fins’ activities aim to reduce negative environmental impacts associated with marine tourism activities as well as improve the management of marine protected areas.
IUCN’s promotion of Green Fins in Bali Ocean Days signals the need for greater private sector engagement in marine conservation across Indonesia and beyond.
Investors, donors, marine tourism operators and stakeholders looking to support scalable marine conservation solutions are encouraged to explore opportunities with The Reef-World Foundation, the international coordinator of the Green Fins initiative. To learn more about sustainable marine tourism and how to get involved, visit www.reef-world.org.
About Reef-World
The Reef-World Foundation is a registered UK charity which delivers practical solutions for marine conservation around the world. The charity promotes the wise use of natural resources – particularly coral reefs and related ecosystems – for the benefit of local communities, visitors and future generations. It is dedicated to supporting, inspiring and empowering governments, businesses, communities and individuals around the world to act in conserving and sustainably developing coastal resources.
Reef-World leads the global implementation of the UN Environment Programme’s Green Fins initiative, which focuses on driving environmentally friendly scuba diving and snorkelling practices across the industry globally. As such, the charity provides low-cost and practical solutions to local and industry-wide environmental challenges associated with the marine tourism industry. It provides education and capacity-building assistance to empower environmental champions (within the diving industry, local communities, authorities and governments) to implement proven coastal resource management approaches.
Visit www.reef-world.org to learn more or follow them on Facebook, Instagram and X.
About Green Fins
Green Fins is a proven conservation management approach – spearheaded by The Reef-World Foundation in partnership with the UN Environment Programme – which leads to a measurable reduction in the negative environmental impacts associated with the marine tourism industry. The initiative aims to protect and conserve coral reefs through environmentally friendly guidelines that promote a sustainable diving and snorkelling tourism industry. It provides the only internationally recognised environmental standards for the diving and snorkelling industry and has a robust assessment system to measure compliance.
Green Fins encourages and empowers members of the diving industry to act to reduce the pressures on coral reefs by offering dive and snorkel companies practical, low-cost alternatives to harmful practices – such as anchoring, fish feeding and chemical pollution – as well as providing strategic training, support and resources. By reducing the local direct and indirect pressures tourism puts on coral reefs, it helps make corals healthier and more resilient to other stresses such as the effects of climate change. Look for the Green Fins logo when booking your next dive trip.Visit www.greenfins.net to learn more or follow the initiative on Facebook, Instagram and X.
News
Filming 360 in The Bahamas

In December 2024, the Shark Trust had a very special opportunity to film sharks and rays in The Bahamas. Frogfish Photography are the Bahamas Dive Ambassadors for the UK. And Caroline, Deputy Editor at Scubaverse, is the Marketing Manager at the Shark Trust. So, when the need arose to film footage of several species of shark and ray for a new Shark Trust project, The Bahamas seemed the perfect fit. A huge thank you is needed here to the Bahamas Ministry of Tourism. As they stepped in to fully support the trip both financially and practically. Ensuring that the filming expedition ran smoothly, and that we got as much time as possible in the water with sharks and rays, during the 10 day, 3 island trip.
The Bahamas is famous for its sharks and rays. Divers flock there to experience getting up close to a range of species. Our itinerary saw us visit Nassau, Bimini and Grand Bahama. It packed in as many in-water experiences as possible and had us dive, snorkel, and even take a submarine to experience them in a variety of different habitats and to capture them on film. We saw 148 sharks and rays from 8 different species (all of which have been logged on the Shark Trust Shark Log!).
But why were we there? The expedition was designed to fulfil the needs of two new projects being launched by the Shark Trust in 2025. The filming done underwater on this trip was the start of creating OneOcean360: A Shark Story. A new 360 immersive experience designed primarily for immersive domes and planetariums. The film will be the nearest experience to getting in the water with sharks and rays without getting wet! It will bring the world of sharks to an audience that may never get the chance to experience it first-hand. A Shark Story aims to deepen people’s understanding of sharks, uncovering and illustrating why they are so wonderful as well as being vital to marine ecosystems.
The film is being made in collaboration with Real Immersive. Also based in Plymouth, they have an immersive dome and are providing the technical expertise behind creating this unique experience. Reviewing the footage in the dome has been an invaluable part of the process. Both inspiring the team and allow us to refine the filming techniques to suit this immersive theatre.
You might imagine that we are using expensive cameras and even more expensive housings. But this is not the case. The entire project is being filmed using Insta360 X4 cameras. With only a few simple additions to the standard dive setup. The INON weight plate allowed us to attach this camera to a dive weight, set it down on sand or wreck, and then swim away and let the sharks be the stars. And the results are very exciting. The film will be ready this autumn. It will be accompanied by an educational pack for teachers to take away after school trips to see the film. Encouraging all those that see it to continue learning about these incredible animals.
You can support the creation of OneOcean360: A Shark Story by heading to the crowdfunder page and donating or selecting a reward.
https://www.crowdfunder.co.uk/p/a-shark-story
Read about the shark and ray dives we did on Nassau, Bimini and Grand Bahama in our next blog post coming soon on Scubaverse.
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