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Giant machines are powered by the biggest engines ever made! They will blow your mind! Some of these engines are larger than multi-story buildings and power the largest trucks and vehicles you will ever see. We look at machines from companies like Caterpillar, Union Pacific Railroad, Boeing, MySE, Aerojet Rocketdyne, and Wärtsilä. Have you ever seen any of these in real life? In this episode of Xplained we take a look at the biggest machines ever created.

Can you imagine our world in 2050? Can you imagine the earth in 2050? Can you imagine people in 2050? Do you want to know the future of earth? By mid-century there will likely be 9 billion people on the planet, consuming ever more resources and leading ever more technologically complex lives. What will our cities be like? How will we eat in the future of Earth? Will global warming trigger catastrophic changes, or will we be able to engineer our way out of the world climate crisis? In the future world demographic changes will certainly be dramatic. Rockefeller University mathematical biologist Joel Cohen says it's likely that by 2050 the majority of the people in the world will live in urban areas of the earth, and will have a significantly higher average age than people today.

At 171 metres long, the USS Pennsylvania is the biggest submarine in the US Navy. It can dive deeper than a thousand feet, sail for 20 years without refuelling, and remain submerged for up to 6 months. The vessel carries a crew of 155 men and a deadly nuclear arsenal. The film investigates how this submarine was made possible through a series of six historic engineering breakthroughs. We explore the inner workings of six landmark submarines, including the tiny Turtle and colossal German U-Boats. Each features a major technological innovation that allowed engineers to build bigger submarines, including the development of underwater breathing, torpedo’s, missile launch systems, and stealth technology. Using computer-generated imagery this film reveals the incredible stories behind these machines and the inventions that have allowed them to grow in size. Six ingenious leaps forward enabling submarines to evolve, from BIG, to BIGGER, into the US Navy’s BIGGEST. 00:00 Introduction 03:11 Breathing Underwater – Turtle Submersible Vessel 13:23 Manoeuvrability – H L Hunley 19:48 Torpedo – U-66 German U-Boat 25:32 Power – USS Nautilus (SSN-571) 32:08 Nuclear Strike – USS George Washington (CVN-73) 39:49 Stealth – USS Pennsylvania (SSBN-735)