This is not a yachting story, but it is incredible.
When an anchor-handling tug sank in heavy weather off the coast of Nigeria, 10 lives were lost. Amazingly, the ship's cook Orene Harrison was found alive two days later after surviving in an air pocket in 30 metres of water!
Finding him was not the hardest part though - getting him back to the surface without killing him posed an even greater challenge for rescuers.
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It provides an important feedback loop within the design team's optimisation process.