The Deep: Series 4 - First look
The Nekton family are back and they're on the trail of their grandparents, who have mysteriously disappeared in this exclusive short clip from the newest episode, out now on iPlayer!
Hot on the trail of Ant and Fontaine's lost grandparents, Kaiko pilots the Aronnax through a tight cave following a video message and a trail of paint...
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Make sure you watch new episodes of The Deep听right now on iPlayer to find out what happens next!
And you can solve your own Mysteries of the Oceans right now with The Deep game!