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It contains 1 million or more parts, including an antenna and receiver to detect radar, cameras that replaced optical periscopes, air turbine pumps to propel torpedoes, air conditioning, seawater desalinization equipment and components for electrical systems and power generators.

One of those components was linked with the ram air turbine and needed to be redesigned to improve its reliability after it failed a noncertification flight test.

In the event that the main power generators all failed, however, the plane’s main lithium-ion battery could provide power to the flight deck for six seconds until a ram air turbine, or RAT, deploys.

Even if that fails, there's a propeller that drops out the back of the aircraft, called a ram air turbine, that provides enough electrical power to run the basic facilities, including a radio.

In the event of both engines failing, the Boeing 777 deploys a “ram air turbine”, which is a windmill-like device that extends from the side of the fuselage into the slipstream.