The remotely controlled vehicle on a Nautilus Live expedition spies the largest toothed predator on the planet.
A female western gray whale swam from Russia to Mexico and back again.
The juvenile female is only the second sighting in Australia and one of the few globally of the species.
Rescuers were forced to abandon efforts to save around 150 melon-headed whales that stranded on a beach on April 10.
The animals can fine-tune the scope of their echolocation calls to broaden or narrow their search for prey.
A 17-million-year-old beaked whale fossil is helping researchers solve a puzzle about the likely birthplace of humanity in East Africa.
Two other tourists were injured when a surfacing whale hit a tour boat.
A team of Australian and New Zealand researchers has tracked scores of blue whales off Antarctica, as the world's largest animals began their songs.
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