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Seabricks new floating bricks are designed to give future ocean cities great foundations

As global sea levels rise and inundate many coastal mega cities countries are considering building oceanic cities.  

Key takeaways

  • An idea as old as the hills, it's been bubbling along in recent times with the Seasteading Institute as its main hub.
  • Despite the backing of Paypal founder Peter Thiel and his bottomless pockets, it seems the group's plan to create its first extra-national floating city-state by 2020 are yet to be realized.
  • According to the Seasteading Institute, it's 72% less expensive than floating concrete, at $360 per ton as opposed to $1,300 per ton, and it'll last as long, or longer, than concrete.
Cite or link to this article

Griffin, M. (2023) 'Seabricks new floating bricks are designed to give future ocean cities great foundations', 311 Institute, 3 March. Available at: https://www.311institute.com/seabricks-new-floating-bricks-are-designed-to-give-future-ocean-cities-great-foundations/ (Accessed: 1 October 2026).

As sea levels around the world continue to rise several countries, from the Maldives to Saudi Arabia and the US, are building massive floating ocean cities, all of which is helping bring seasteaders dreams of a floating utopia with a fluid geography, free from oppressive government in international waters, closer to reality. But to realise their dreams seasteaders are going need something to build their watery utopia on top of, and these interlocking seaweed bricks might be it.

It's an odd little political movement, seasteading. An idea as old as the hills, it's been bubbling along in recent times with the Seasteading Institute as its main hub. But main hubs are hardly the idea; this is a movement for folk that feel the nation state has outlived its usefulness, who want to go as far off grid as it's possible to go, into the middle of the oceans.

To do so these groups plan to abandon land altogether, and create independent floating societies at sea, every man his own L. Ron Hubbard, free to choose his own destiny beyond the reach of any country's lawmen. Seasteaders could clump together in floating villages, or drift apart. Groups could each try their own ways of running things, and if you were living in one group, but liked the cut of another group's jib, you could detach your home and move your family across to join them. They'd be modular political test-beds, encouraging people to criticize by creating, and the voting would be done with one's feet. Or at least outboard motors.

Despite the backing of Paypal founder Peter Thiel and his bottomless pockets, it seems the group's plan to create its first extra-national floating city-state by 2020 are yet to be realized. But the dream is very much alive, and several groups are trying to get seasteads off the ground in various different countries.

Seabrick is a small company, toiling to liberate itself from the oppressive whip of the Canadian government in Vancouver, and it's created a building unit specifically designed for the high seas. Seabricks form a kind of floating Lego set, their complex shapes interlocking together to create platforms and structures.

According to the Seasteading Institute, it's 72% less expensive than floating concrete, at $360 per ton as opposed to $1,300 per ton, and it'll last as long, or longer, than concrete. Compared with metallic pontoons, it'll beat the per-ton price of aluminium pontoons by 83%, and steel ones by 58%. The numbers get even better if you create hollow pontoons with your Seabricks, says Seabrick.

They’re made primarily out of kelp or sargassum, the latter a seaweed that gets pretty stinky when it decomposes. Seabrick says that gathering this stuff up from shorelines is tantamount to a public service. These seaweeds are dried, chopped up, combined with "some biologically sourced additives" and cast in a compression press before being coated with "a non-toxic polymer." Each brick sequesters carbon, making them carbon negative, and takes "little energy and heat" to manufacture, making it a significantly better building material than concrete for the environment.

The company says it's designed to build "marine infrastructure of all kinds, from wave breaks and offshore platforms to floating homes and ocean-based communities." When you're done with whatever it is you've built, or you come into a new pile of Seabricks and decide it's time for a second story, your structure can be carefully pulled apart, modified or built anew re-using the original bricks.

There's no information as yet on availability, but I have a feeling you may be able to buy these things with crypto, just sayin’.

Source: Seabrick

311 Intelligence

What this means for your organisation

Rising seas raise the stakes.

Global sea level rise has more than doubled in pace since 1993 and is still speeding up. Several countries are already building floating ocean cities. Planners need to know what these structures can stand on.

Materials may carry the carbon story.

Seabricks are made from dried kelp or sargassum and are carbon negative. They take little energy and heat to make. Concrete is the comparison, and CO2-cured concrete is another route to cut its footprint, so test both against your own needs.

Reuse and hype both need checking.

Seabricks can be pulled apart and rebuilt, which suits modular, changing structures. Yet there is no information on availability. Seasteading's first floating city-state has not appeared, and crypto cities have mostly stalled, so treat the claims with care.

Three questions for your next leadership meeting

  1. Which of our coastal assets face the greatest risk as seas rise?
  2. Could reusable, modular floating structures suit any of our projects?
  3. What evidence would we need before trusting a new marine building material?

The trends and technologies behind this story

From the 311 Starburst, the 311 Strategic Intelligence Unit’s map of the technologies and trends shaping the next 50 years.

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Analysis by the 311 Strategic Intelligence Unit, from Matthew Griffin’s article and 311 data. First published on Fanatical Futurist.

FAQ

Why does this matter?

As global sea levels rise and inundate many coastal mega cities countries are considering building oceanic cities.  

Matthew Griffin

About the author

Matthew Griffin Founder, 311 Institute

Matthew Griffin is a multi-award winning Futurist and expert in Disruption and Innovation, Geopolitics, Leadership, and Technology, who NASA have described as a "walking encyclopaedia of the future" and a "futurist Polymath."

Read full bio

Matthew Griffin is a multi-award winning Futurist and expert in Disruption and Innovation, Geopolitics, Leadership, and Technology, who NASA have described as a "walking encyclopaedia of the future" and a "futurist Polymath." 17-time best selling author of the "Codex of the Future" series, Matthew is the Founder and Futurist in Chief of the 311 Institute, a global Futures and Deep Futures advisory firm working with royal households, world leaders, G7, G20, and G77 governments, NGOs, and multi-national mid and mega cap firms to help them explore, shape, and lead the next 50 years of business and society.

An award-winning YouTube creator with over a million followers, with an unrivalled global reach and impact, Matthew is a highly sought-after international keynote speaker, lecturer, and mentor who collaborates with global leaders through the United Nations Alliance of Civilizations (UNAOC) and United Nations General Assembly (UNGA) to shape pivotal initiatives such as the UN’s AI for Humanity program, the United Nations Conference of the Parties (UN COP), and the World Economic Forum in Davos.

As the former Global Head of Cloud, National Security, and Enterprise Sales for companies including Atos, Dell-EMC, and IBM, Matthew has a proven track record of building multi-billion dollar business units and turning failing divisions into market leaders. His ability to identify, analyse, and communicate the implications of hundreds of emerging technologies and trends is unparalleled, and his insights are trusted by many of the world’s most respected organisations, including ABB, Accenture, Adidas, AON, ARM, BCG, Centrica, Citi, Coca-Cola, Dentons, Deloitte, Dow Jones, EY, Google, KPMG, Lego, Legal & General, LinkedIn, Microsoft, PepsiCo, Qualcomm, RWE, Samsung, Siemens AG and Siemens Energy, T-Mobile, UBS, VISA, Walmart, Workday, Worldpay and many others.

Regularly featured in the global media including the AP, BBC, Bloomberg, CNBC, Discovery, Forbes, Khaleej Times, Telegraph, TIME, ViacomCBS, WIRED, and the WSJ, Matthews mission is to help organisations create a fair and sustainable future whose benefits are shared by everyone irrespective of their ability, background, or circumstances.

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Sources and further reading

  1. According to the Seasteading Institute seasteading.org
  2. Seabrick seabrick.ca

Source: first published by the 311 Institute on 3 March 2023. Cite as: Griffin, M. (2023). Seabricks new floating bricks are designed to give future ocean cities great foundations. 311 Institute. https://www.311institute.com/seabricks-new-floating-bricks-are-designed-to-give-future-ocean-cities-great-foundations/

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