By scanning the locations at the bottom of the ocean where sunken ships, treasures and even cities lie, the show tries to answer what they look like, how they got there and if they hide any secrets.
Michael Polley Harry Gulkin Susy Buchan 约翰·布钱 Mark Polley Joanna Polley Cathy Gulkin Marie Murphy Robert MacMillan Anne Tait Deirdre Bowen Victoria Mitchell Mort Ransen Geoffrey Bowes 汤姆·巴特勒
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