Australian investment banker Keith Tuffley might normally be found, you’d think, plotting a corporate takeover on a spreadsheet, or wheeling and dealing with clients. But for the past four months, the 60-year-old has instead typically been found plotting points on a map, or at the wheel of Abel Tasman, his 75-foot Bermuda schooner.

Earlier this year, the former head of investment banking at Goldman Sachs Australia chucked in a job as chairman of sustainability at Citi in London to realise a lifelong dream of sailing the Arctic’s Northwest Passage.