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All Seasons

Season 2019

  • S2019E01 Why Bridges Collapse: The Genoa Disaster

    • August 12, 2019
    • BBC Two

    The story of some of the people on the Polcevera Bridge on the day of its collapse, investigating what caused the bridge to fail so catastrophically.

Season 2022

  • S2022E01 Why Ships Crash

    • January 18, 2022
    • BBC Two

    When the Ever Given blocked the Suez Canal, it triggered a global crisis. Featuring eyewitnesses speaking for the first time, this documentary aims to find out what really happened.

  • S2022E02 Why Buildings Collapse

    • July 5, 2022
    • BBC Two

    In 2021, Champlain Towers South – an apartment building near Miami – collapsed, killing 98 people. This film forensically examines what happened and asks: what went wrong?

Season 2023

  • S2023E01 Why Sharks Attack

    • July 18, 2023
    • BBC One

    After three recent fatal shark attacks in Egypt, this film investigates whether pressure from human activity and climate change is altering the behaviour of sharks.

Season 2024

  • S2024E01 Why Planes Vanish: The Hunt for MH370

    • March 6, 2024
    • BBC One

    Ten years after Malaysia Airlines Flight MH370 and its 239 passengers and crew vanished, can new evidence help locate the plane and finally solve aviation’s greatest mystery?

  • S2024E02 Why Trains Crash

    • July 18, 2024
    • BBC One

    On 2 June 2023, a triple train crash killed nearly 300 people and injured more than 800 in India’s eastern Odisha state. This film examines what went wrong and explores the causes of train disasters.

  • S2024E03 Why Bridges Collapse: The Baltimore Disaster

    • December 5, 2024
    • BBC One

    MV Dali, a huge container ship, crashes into the Francis Scott Key Bridge in Baltimore, tragically killing six people and completely destroying the bridge. Investigators reveal how it happened.

Season 2025

  • S2025E01 Why Cities Flood: Spain's Deadly Disaster

    • June 24, 2025
    • BBC One

    Dramatic mobile phone video and eyewitness accounts tell the story of the 2024 floods that swept through towns in Valencia, killing 228 people. Did climate change play a part?