The seal does not open with a key: it opens by answering. Strike the bar to the same beat the rivets of the weld seam are giving.
Short strike = dot · long strike = dash. Every digit is exactly five signals, so each group closes itself on the fifth.
The Morse chart has been bolted to that door since 1974 and nobody had ever looked at it: it passed for part of the container. The message does not blink in any lamp either — it is in the rivets of the weld seam, round ones and long ones. And the seal is not read: it is answered.
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