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CDs are extremely reflective, so having at least one would be a good way to signal for help from a passing ship/plane using reflected sunlight.

(I helped save b3ta! Mr. Tea 'ulmmm'/'mmneurgh', Wed 19 Feb 2025, 19:52, archived)
better to take a laserdisc

(I helped save b3ta! Cheers Cheers, Wed 19 Feb 2025, 20:01, archived)