THE EMERGENCY ISOLATION ROOM
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This room contains the cut relay bus and a local knife switch. It is not
a destruction chamber. Its purpose is to preserve a deliberate gap in
the network.

A paper label says:

    19 MUST REMAIN PRESENT BUT SILENT

Below it:

    A MISSING BEAT PREVENTS THE SONG

The station can be kept isolated without being destroyed. The choice is
not between repair and ruin. It is between joining and remaining lost.