The 68th Cannes Film Festival has passed the halfway point and our intrepid film critic Lisa Nesselson is in the thick of things. Today, she tells us about two films shown in competition: "Sicario", by Canadian director Denis Villeneuve, which focuses on the US war on drugs, and "Marguerite & Julien", by France's Valerie Donzelli, a story about forbidden love between a brother and sister.

We also hear from Jean-Michel Cousteau - the son of famous French oceanographer Jacques Cousteau - about his upcoming documentary "Odyssea 3D", and get a sneak peek at some of its stunning underwater footage.

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