The peninsula is a haven for wildlife: humpback whales in the crystal blue water, elephant seals beached on Pleneau Island, squawking adelie, chinstrap and gentoo penguins, and wheeling cormorants, petrels and terns.

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Nonetheless, his home is comfortable and seals out water and Beijing's famous dust storms, Meyer said.

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The island is home to some 64, 000 Cape fur seals, which must swim across water that reaches depths of 20m just 50m from the shore.

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Ms Bell said while grey seals do travel upriver, their bodies are adapted to salt water conditions.

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Once the seals are fitted with their sensors, they are taken out to open water on their own personal speed boat, the Steller Shuttle.

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