What is that SPIRAL in the Jet Engine?

What is the purpose of that, funny looking, spiral in the centre of the Jet engine on modern aircraft? Why am I not allowed to walk under the wings while Boarding?
These are some of the questions that I will be answering in todays video so make sure you stay glued to the video until the end!
If you have more questions about strange procedures around aircraft, don't hesitate to ask me in the comments!

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Видео What is that SPIRAL in the Jet Engine? канала Mentour Pilot