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.
该纪录片分为两部分，讲述了一位母亲把女儿送给别人收养，在后者于1989年失踪后，这位坚毅的女性揭开了该案的重重迷团。
