Our captain slips a hydrophone below the surface and
fine-tunes the underwater listening device so we can hear the clicks, pings, whistles and sounds may by our sperm whale pod.

Sperm whales make distinctive clicking noises and we'll soon know if any animals are within the sensor's two-mile range.

Babies sound like an old time watch, going click-click-click. Female clicks are stronger and faster, like horses galloping. The males, when present, sound like metal hitting an empty bottle but with the speed of a pile driver.

Sperm whales logging

Some of the whales begin logging, resting on the surface. They've undoubtedly seen our boat countless times and at first pay little attention even when we are as close as 30 yards.

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