How can I get the rope?
You need to get the rope on each level of the spool to align. Do this by turning each level separately.
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And watching how it affects the other levels.
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Turn the outermost circle until the two inner circles align. Then turn the two inner circles until they align with the outermost one. Pull on the rope end in the center.
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If you don't have something to cut it with, you'll need to go back to the security office.
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There's an evidence folder on the desk.
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Unstaple the cover letter to move it out of the way, and tear the envelope open.
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Use the murder weapon on the rope.
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Now tie the rope on the empty area of railing next to the boat to secure it, and climb down.