Why researchers are headed to the wrecks of two polar explorers' ships

The Royal Canadian Geographical Society is funding an expedition to two shipwrecks: the Quest, which was used in Ernest Shackleton's final Antarctic expedition in the 1920s and sank 40 years later, and the Terra Nova, which carried Robert Falcon Scott on his last expedition from 1910 to 1913 and sank during the Second World War.

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