by Ashley Yau

How Hong Kong entrepreneur Vriko Yu turned scientific experimentation into 3D-printed tiles to revitalise coral reefs.

 

While many Hong Kong youth chase urban dreams in office buildings, 90s-born Vriko Yu has left her footprints on the coral communities off Sai Kung. As the Co-founder and CEO of Archireef, she leads an interdisciplinary team using a nature-based solution empowered by 3D printing technology to create “custom homes” for threatened coral reefs in challenging marine environments. From Hong Kong’s Hoi Ha Wan Marine Park, which is home to more than 60 coral and 120 fish species, to Abu Dhabi in the United Arab Emirates, she has brought Hong Kong-originated environmental innovation to the world.

Now based in Abu Dhabi, Vriko shares her journey with Youth Hong Kong, from witnessing the decline of corals to enabling their protection after repeated failures in the laboratory. This is not only a story of perseverance in environmental protection, but also a reflection of the power of Hong Kong’s youth to push boundaries and pursue their dreams.

Vriko’s attachment to this landscape and seascape quietly sowed the seeds of passion, with nature becoming part of her identity.

Growing Up With Nature

When people think of Hong Kong, they often picture row upon row of skyscrapers, but Vriko’s childhood had a different backdrop. “I was born in the 1990s and was lucky enough to grow up in a rural part of Hong Kong,” she recalls with a smile. “My dad’s favourite place was Sai Kung, a place that coloured almost my entire childhood.” With the bustling urban skyline on one side, and the wild mountains and the sea on the other, this “half-and-half” upbringing has become her lifelong treasure.

About 40% of Hong Kong’s land consists of designated country parks and special areas according to government statistics. The sea, including Victoria Harbour, covers nearly 60% of the territory’s total area. This coexistence of urban life and nature is deeply etched in Vriko’s bones.

Her attachment to this landscape and seascape quietly sowed the seeds of passion, with nature becoming part of her identity.

In 2014, as she was about to graduate from the Chinese University of Hong Kong, where she studied natural science, Vriko obtained diving certification and began diving every week off Sai Kung. What she saw under the water has changed her academic path and her life’s trajectory.

She watched a 2-metre by 2-metre coral community degrade in just two months. “I watched it change from stressed to dying. The speed was terrifying. When you see corals dying before your very eyes, you truly realise the impact of climate change,” Vriko adds.

 

I saw climate change happening right in front of me. It was terrifying.

 

“That was my epiphany. I realised that its impact is so much faster and greater than we’d ever anticipated or learned from textbooks,” she continues. “From then on, I became very curious about what is happening to the ocean and wanted to find out if there was anything scientists could do about it.” After that, she worked as a research assistant and then chose coral restoration as the focus for her PhD thesis.

 

Failure Not An Option

When Vriko and her supervisor Professor David Baker first started working on coral restoration at the University of Hong Kong, they made many detours. They tried the traditional method commonly used worldwide at that time — extracting live coral fragments like surgeons, growing them in flat artificial nurseries, and then transplanting them to natural rocks or concrete blocks after two years of cultivation.

But despite their persistence, this led to four consecutive years of failure. “We found that Hong Kong’s underwater environment is very special. The depth where corals grow lacks a stable attachment base, and the metal steel bars and concrete blocks we used at that time were either not stable enough or had too high a pH value, making them completely unsuitable for coral growth,” Vriko recalls.

After two years of cultivation, the coral survival rate plummeted to around 20% and dropped even more by the third year. “It was frustrating. We clearly knew what we needed to do, but we couldn’t find the right way.”

But the team didn’t give up. A bold idea gradually took shape: could they create a stable and comfortable “custom home” for corals? She and Professor Baker, thought of 3D printing and clay materials. Clay is suitable for the marine environment, and 3D printing can create complex structures in a cost-effective way that fits the growth needs of different corals, she recounts.

So the team contacted two architects from the School of Architecture to collaborate across disciplines on creating what would later become the 3D-printed reef tiles. The bottom layer is like a tennis racket, she says, and the top layer imitates the structure of brain corals with many gaps. It can firmly fix the coral skeleton, reduce sand abrasion, create habitat complexity, and help mitigate sedimentation problems.

What’s more, these reef tiles can be customised. Different corals have different growth forms — some look like small trees, some like rocks, and some like blade. Vriko and the team used 3D printing to create different grooves and gaps to adapt to their growth needs. While the new solution, which took the team another four years to finalise, seemed revolutionary and ground-breaking, behind it were the solid steps taken to solve a scientific problem.

 

From Idea to Real Impact

In her third year of doctoral studies, when the 3D-printed reef tile project was gradually maturing, Vriko made a bold decision to step out of academia and to establish Archireef, bringing the technology from the laboratory to real-world application. “As scientists, we are used to the cycle of discovering problems, solving problems, and publishing papers,” she says. “But I didn’t want this technology to stay in published papers only. I wanted to see it have a real impact.”

But the road from scientist to entrepreneur was far more difficult than she imagined. “I had no business experience at that time, and I didn’t even know how to build a business model. There were no reference cases in the world,” Vriko admits. Fortunately, the Hong Kong Science Park gave her support, from building a business model to making the necessary connections.

Opportunity also came unexpectedly. Archireef’s technology was featured at the World Economic Forum, attracting the attention of a sovereign wealth fund in Abu Dhabi and allowing the startup to expand outside Hong Kong.

Today, Archireef’s 3D-printed reef tiles have been deployed in many countries and regions, including the United Arab Emirates, Hong Kong, Singapore and Saudi Arabia. The team works closely with local scientists and institutions around the world to understand site-specific coral species and environmental conditions, adapting solutions accordingly.

3D printing can create complex structures in a cost-effective way that fits the growth needs of different corals.

When talking about her entrepreneurial success, Vriko is very humble: “I have always felt that 99% of our success is luck and 1% is hard work. There are too many uncontrollable factors on the entrepreneurial road. We just happened to seize the opportunity and never give up.” She admits that in her five years of entrepreneurship, she has seen many failures, so she believes Archireef is very lucky to be among the few survivors.

She attributes Archireef’s success to Hong Kong being a coastal city with unique geographical advantages, while having environmental challenges to be solved. “We’re in a highly urbanised, subtropical region not known for corals. Yet, we have more than 84 hard coral species, more than the entire Caribbean. So, all of that combined makes Hong Kong a very interesting testing lab.”

Historically, corals were once widespread across Hong Kong, from Sai Kung to Lantau Island. However, before the government’s major wastewater and harbour‑cleanup, decades of pollution had severely damaged marine ecosystems. Even after efforts to improve water quality, coral recovery has been slow. These factors, according to Vriko, have played a role in the need for proactive environmental solutions.

As a young entrepreneur, Vriko thinks that young people need to unlearn traditional concepts like needing to be fully prepared before they start. Having grown up in an environment where failure was not allowed, Vriko reminds us that on the entrepreneurial journey, failure is the norm and is a vital part of growth.

 

Letter to Future Generations

Today, Vriko spends half her time advancing projects in Abu Dhabi and the other half back in Hong Kong, continuing to carry out her work in marine restoration.

“We cannot be satisfied with net zero emissions. ‘Do no harm’ is not enough. We also need to strive for net gain, to recover the lost marine ecosystems bit by bit,” Vriko says, her eyes shining. “Hong Kong has the ingredients to lead, with outstanding talents, strong institutions, and a young generation who cares about nature.”

Vriko thinks the city could become a key hub for the development of the blue economy, and that Hong Kong’s young people can fully leverage this advantage to build their own pathways for environmental protection and marine conservation.

What Vriko built through Archireef is not just technology; it’s a metaphor for all restoration. When nature is given the right space, it finds a way to return.  ■