At night, the dunes of the Arabian desert come to life with unique animals specially adapted to thrive in this hostile environment, from lizards that swim under the sand to spiders that can run ten miles per hour.
Weather threatens to wreck Georg's plan to deal with a medical emergency. Jo struggles to get a group of Chinese tourists on their flight.
Lemon sharks school at the surface before a dive. This image is from Man vs. Shark.National Geographic/Devon Massyn