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From the Sydney Opera House to a basic kitchen renovation there are thousands of examples of construction projects large and small which go horribly over budget.Professor Bent Flyvbjerg has compiled a database of 16,000 projects, and by his reckoning only 8.5% them meet their initial estimates of cost and time. He talks to Sam Fenwick about his new book, “How Big Things Get Done”.Presenter / producer: Sam Fenwick Image: Sydney opera house; Credit: Getty Images

In September 2021, a volcano erupted on the Spanish Canary Island. It lasted nearly three months. Red hot lava spilled out and destroyed homes, businesses and everything in its path before reaching the sea 10 days later. It split the island in half.Eighteen months on, we travel back to La Palma to see how the islanders are rebuilding their livelihoods and infrastructure.Presented and produced by Ashish Sharma.(Image:Karin Bansberg watering plants outside her temporary wooden home. Credit: BBC)

The rush to extract battery metals from the bottom of the ocean and what that could cost financially and environmentally. Michelle Fleury sees a specialist mining robot in action and hears the arguments for and against deep sea mining. Presenter / producer: Michelle Fleury Image