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"Icebergs are inherently dangerous. I would be extraordinarily happy if it just completely missed us," sea captain Simon Wallace tells BBC News, speaking from the South Georgia government vessel Pharos.

The detective’s singular pedigree: He’s the son of an Irish folk singer mom and a Basque sea captain dad.

There would be no salary, but all expenses paid - and, crucially, Mr Guerra would gain some of the sailing experience he needed to qualify as a sea captain.

Published in London in 1789, his memoir told of being captured, carried across the ocean to Barbados, and sold to a merchant sea captain.

And what of Al Anderson, the Rhode Island fisherman whose myopic devotion to his quarry recalls another famous New England sea captain?