THE MAINTENANCE NOTEBOOK
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The pages are written by several hands, but the instructions repeat.

    Never answer with a person.
    Stations can answer.
    People cannot.

Another entry:

    608 is quiet again.
    Lake system holding.
    Do not acknowledge the voice below carrier.

The final legible page says:

    Three tones are not an alert. They are synchronization.
    03:13 is when the surface node and the lower array align.
    RETURN ONLY is an engineering instruction.