In 2019, Smithsonian magazine published a profile of an American inventor, entrepreneur, and undersea explorer named Stockton Rush. Rush and his company, OceanGate, had recently celebrated the successful descent of their experimental manned submersible Titan to the extraordinary depth of 4,000 metres. Titan’s design was innovative in two important ways: its body was composed centrally of carbon fibre, which made it light and comparatively inexpensive to operate, and it was a cylinder. A spherical sub might have had ‘the best geometry for pressure’, observed Rush, ‘but not for occupation’ – and this represented an unpalatable check on OceanGate’s plans to deliver groups of high-paying tourists to the wreck of the Titanic. ‘I had come across this business anomaly I couldn’t explain,’ Rush reflected: ‘If three-quarters of the planet is water, how come you can’t access it?’
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