Seawer is a design concept, not a working machine. South Korean designer Sung Jin Cho drew it in 2014 as a giant floating "seascraper" that would sit in the Great Pacific Garbage Patch, strain plastic out of the water, recycle it on board and turn the flow of seawater into electricity. It won an honourable mention in that year's eVolo Skyscraper Competition, and it has never been built.
The idea is still worth a look, because it shows both how designers imagine tackling ocean plastic and why the real problem is harder than a single dramatic structure can solve.
What Seawer is, in short
Cho's entry, titled "Seawer: The Garbage-Seascraper", was one of the honourable mentions in the 2014 eVolo competition. eVolo, an architecture magazine, runs the contest every year to collect speculative ideas about what tall buildings could become. In 2014 the jury looked at 525 projects from 43 countries and announced the results on 21 March. First place went to Yong Ju Lee's "Vernacular Versatility".
Speculative is the key word. eVolo entries are meant to provoke ideas about technology, ecology and cities, not to be engineered and built. Seawer belongs in that tradition: a visual argument that a skyscraper could point downwards into the sea and do useful work there.
How the floating tower would work
The renderings show an enormous funnel. Its wide, ringed top floats at the surface like a landscaped island, and its narrowing body hangs deep below the waterline.
According to the project description that circulated in 2014, the centre of the structure would be a drainage opening about 550 metres across and 300 metres deep. Seawater carrying debris would pour in through the rim and fall towards the bottom of the funnel.
On the way down, the water would pass five layers of filters modelled on baleen, the comb-like plates that whales such as humpbacks use to sieve food from seawater. The idea was that each layer catches finer pieces than the last.
The falling water would also drive turbines, which is why Cho called the tower a hydroelectric power plant. Sunlight on the upper decks and the energy of the plastic itself (through recycling or processing) were presented as further sources of power, so the structure could in theory support itself.
Plastic and water go separate ways
Captured plastic would move by conveyor to a recycling chamber that turns it into granules, the raw material of new plastic products. The cleaned water would settle in a large sedimentation tank at the base before being released back into the ocean.
Staying upright in open water
A structure this size would roll and heave in waves, wind and currents. The diagrams show water-gyro stabilisers and variable-pitch propellers to keep it steady and to let it drift slowly from one polluted area to another.
The cross-section below labels the main layers: an inner rim and core wall, the baleen filter zone, and an outer rim with an impermeable surface wall.
The last diagram sums up the promise: dirty water in, clean water out.
What the Great Pacific Garbage Patch really looks like
Seawer was aimed at the Great Pacific Garbage Patch, an area of the North Pacific between California and Hawaii where ocean currents in the subtropical gyre gather floating debris.
The best-known measurement came four years after Cho's design. A 2018 study in Scientific Reports, led by Laurent Lebreton of The Ocean Cleanup, estimated that the patch covers about 1.6 million square kilometres and holds at least 79,000 tonnes of plastic in roughly 1.8 trillion pieces. That mass was four to sixteen times higher than earlier estimates. The area is a little more than twice the size of Texas, which is why that comparison keeps appearing in news stories, although researchers stress that the patch has no fixed edge.
Two other findings matter for any cleanup design:
- Microplastics, pieces under 5 mm, made up about 94% of the pieces but only 8% of the mass.
- Fishing nets accounted for at least 46% of the mass, and debris larger than 5 cm made up more than three-quarters of it.
Common myths about ocean garbage patches
"It is a floating island of rubbish"
It is not. The debris is spread thinly through the upper layer of the water, and most of it is too small to see from a ship or a satellite. You could sail through the patch without noticing much. That is one reason a single fixed structure would struggle: the plastic is everywhere and nowhere in particular.
"A big enough filter would solve it"
Filtering huge volumes of seawater also catches plankton, fish larvae and other life that drifts in the same layer. Any real system has to collect plastic while letting living things pass, and it has to be maintained far from shore. The Seawer concept does not explain how its baleen filters would avoid harming marine life, a question that would be central for an engineered version.
"Cleaning the ocean is the main fix"
Cleanup helps, but it treats the end of the pipe. Most researchers point out that stopping new plastic from reaching the sea, through better waste collection on land, river barriers and recovering lost fishing gear, has to come first, or any cleanup will be outpaced.
What has been tried since 2014
The Dutch non-profit The Ocean Cleanup, founded by Boyan Slat, has done the most visible work in the patch. Its first system was deployed in September 2018. Later versions use long floating barriers towed slowly by ships to sweep debris into a retention zone, and the group reported passing 100,000 kg removed in 2022 before moving to a larger third system.
These systems look nothing like Seawer. They are low, mobile and modest, built to be serviced and improved. That contrast is the useful lesson from the concept: big visions draw attention, but practical progress tends to come from smaller machines tested in real water.
Why a concept like Seawer still matters
Design competitions exist to widen the conversation. Seawer combined three ideas that remain relevant: treating waste as a resource to be recycled at sea, borrowing from nature (the whale's baleen), and asking infrastructure to generate its own energy. Each of those threads appears in real projects today, even if no one is building an inverted skyscraper in the Pacific.
If you want to help with ocean plastic in everyday life, the most effective steps are unglamorous: cut single-use plastic where you can, dispose of waste properly, support beach and river cleanups, and back policies that improve waste collection and hold producers responsible for packaging.
Sources: e-architect: eVolo Skyscraper Competition 2014 winners; The Ocean Cleanup: Lebreton et al., Scientific Reports, 2018; Wikipedia: Great Pacific garbage patch; original project report via Inhabitat and The Mind Unleashed; renderings by Sung Jin Cho.
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