Gregg Wallace is in Leeds, at a massive mattress factory where they produce 600 bouncy beds every day. He follows the production of pocket-sprung mattresses from the arrival of hard steel to soft bedding heading out of dispatch. 4/9

Under Scotland's capital we explore the now hidden arches and vaults of South Bridge. Beneath Naples we see how the excavation to build above ground has left an extraordinary imprint underground. 9/4

An international team of volcanologists draw parallels between the volcanoes on Earth and those on other planets, and reveal how they are not just a destructive force but essential to the formation of atmospheres and even life itself. 1/1

From space Earth is a kaleidoscope. Turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean. 3/4

Ben journeys to Ireland's rugged Atlantic coastline in the bleak midwinter. He stays with Judith, an 80-year-old who rejected a modern way of life for one closer to nature. Ben learns how she and her late husband created a unique utopia. 7/8

Sue Aikens heads out on an 85-mile unpredictable journey through the Alaskan tundra. Meanwhile, Chandalar Glenn searches for a fire kit. 9/20

The Category 4 Hurricane Maria is chronicled by a petrified student as it completely decimates the Caribbean island of Puerto Rico, cutting off power and water for months. 6/13

From space Earth is a kaleidoscope. Turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean. 3/4