The machinery depicted in the Metroid Prime Trilogy intro sequence

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The intro video of Metroid Prime 3 has the camera backing out through a tunnel full of machinery. Is it known what this is? Is it the interior of Samus's arm cannon?

If this is a spoiler, please mark it as such; I have not completed Metroid Prime 3.

Best Answer

It's not a spoiler. It's the internal workings of her arm-cannon charging and firing a shot, shown in slow motion. Samus is in the middle of the final battle of Super Metroid, fighting Mother Brain.

[Edit] See comment below!